12 Best Smartwatch With Oxygen Sensor (SpO2 Watch 2023)

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Blood pressure measuring, heart rate monitoring, and blood oxygen saturation measuring are the three most important fitness tracking features in a smartwatch. Though most of the watch contains the first two but lacks the blood oxygen saturation feature.

Here, we are reviewing the best smartwatches with Oxygen sensors that provide reliable results for blood oxygen measuring tests.

The smartwatch market contains a lot of these watches and we have shortlisted 12 of those and these are the best of the best.

This blood oxygen saturation measuring feature is a handy feature while you are at high altitude or doing gym as this time our body needs more oxygen and you can have an idea of how much oxygen the body is getting.

12 Best Smartwatch With Oxygen Sensor Reviews | SpO2 Watch For All Budgets

Smartwatches with an oxygen sensor do not just come with an oxygen sensor but it has many exciting features. Let’s know about those in detail.

Our top picks: At a glance

  1. Best for Everyday Use:  Amazfit GTS 4 Mini
  2. Best all-round activity tracker: Garmin Venu GPS Smartwatch
  3. Best for Durability: Amazfit GTR 4
  4. Best for Tracking: Apple Watch Series 8
  5. Best for Accurate Health Tracking: TicWatch Pro 3
  6. Best for Instant Blood Oxygen Measuring: Amazfit GTS 2 Mini Fitness Tracker
  7. Best for the Battery Life: Amazfit Bip U Pro Smartwatch
  8. Best for Health Features: Samsung Galaxy Watch 4 Classic
  9. Best for Athletes: Garmin Forerunner 945
  10. Best for the Reliability: Fitbit Sense Advanced Smartwatch
  11. Best for the Outdoor Enthusiasts: Popglory Smartwatch
  12. Best for Affordability: CanMixs Smart Watch

Best Smartwatch with Oxygen Sensor (SpO2)

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1. Best for Everyday Use – Amazfit GTS 4 Mini

Amazfit GTS 4 Mini is a suitable watch for those who are too strict about maintaining time with life. We call it a lifesaver for some mind-blowing features. This watch can have everything in one. You can track your heart rate, sleep and quiet alarms.

Along with those traits, this one also comes with Alexa-built in and powerful Zepp OS. However, there are some more things that you’re gonna miss if you skip this watch from your shopping haul.


  • Screen Size: 1.65 inches
  • Water Resistance: 5 ATM or 50 m
  • Operating System: Zepp OS
  • Compatible Device: Smartphone
  • Special Feature: Universal
  • Band Material: Silicon
  • Display: OLED
  • Resolution: 336×384 pixels
  • Battery Type: Lithium Polymer
amazfit gts 4 mini

Comfortable Outdoor Journey

To position such a wristwatch is really easy and less complicated. You can position this watch by the help of 5 satellite positioning systems. These special features will make most of your outdoor journeys more comfortable.

This one uses circularly-polarized antenna technology which is worthy to improve positioning performance and accuracy.

Alexa Built-In & Powerful Zeep OS

One can easily set an alarm, ask any question, speak over translation, and more for the Alexa built in.

Again, it comes with an excellent operating system named powerful Zeep OS which features over 10 mini apps including home-improvement third party apps. This is pretty easy and efficient to enhance your daily life.

Other Beneficial Feature

Amazfit GTS 4 is completely different about the app navigation. All the fitness features are accurate and provide 100% true results. Health monitoring apps like OX2, heart rate, blood oxygen saturation works with more clarity than others. It also comes with 120+ sports and smart recognition.

Long Durable Battery Life

You wouldn’t like to use such a watch which has very shabby battery life and power. In this case, this one may be enough to cover all the work you do at once. This watch has battery of 15 days of endurance on primary usage and 45 days on saver mode.


  • For the long-lasting material, it can last more than a year
  • Easy to wear for the small wrist hand people
  • Comfortable display and wide enough to observe
  • Good water resistance to do primary work related to water
  • Comes with smart health monetization and sports tracking features


  • The watch face is easily got scratches after using for long time
  • Bluetooth’s connection is totally annoying and poor


  • Case Diameter: 43mm
  • Display Type: AMOLED
  • Batter Service: Up to 5 days
  • Physical Size: 1.7 x 1.7 x 0.49 inches
  • Weight: 45 grams
  • Screen Size: 1.2 Inches
  • Compatible Devices: Smartphone
  • Operating System: Android, iOS
  • Connectivity: GPS
Garmin Venu

Oxygen Sensor

If you want more to know about your health except for sleep tracking, and heart tracking, then this particular beautiful watch is for you. Yes, unlike most other watches, Garmin Venu can even keep track of your respiration and monitor your body’s energy.

Body energy monitoring is, of course, a unique option that is rarely found in most other smartwatches. Thanks to the Garmin Venu, it can notify you about how much energy you are stored every day. By noticing it carefully, you can know when you need to eat or sleep to bring back the needed energy to your body.

Health Tracking

Like your well-wisher friend, it can remind you of doing workouts. It’s not the end, of course. The wristwatch can show you how well you are working out right on the timepiece screen. Different outdoor and indoor sports like running, yoga, swimming, and so on are included in the watch to help you do them in the right amount.

Additional Features

The timepiece has more to offer you. You will never feel bored when you wear it since you can listen to whatever songs you like when your smartphone is connected with the smartwatch. Also, you can download songs right from your watch. Play the songs you have on Spotify, Amazon, Deezer. You just need the subscription. Get yourself a pair of wireless headphones and enjoy music as long as you want.


  • Vibrant AMOLED display
  • Fashionable design
  • Various health monitoring
  • Lets the user download songs through it
  • Shows fitness tracking results with accuracy


  • It doesn’t have a waterproof model

Read Next: Comparison of Garmin Venu vs. Vivoactive 4 reviews

3. Best for Durability-Amazfit GTR 4

Lastly, we have Amazfit GTR 4 which is good for durable, long-lasting, fantastic leather finish. You will enjoy this watch for the special feature known as industry-leading, dual-band system and circularly-polarized GPS antenna technology.

This one is quite similar to the feature, which is usually used in the aircraft and automotive fields. People will become more beneficial by enjoying stronger positioning. It also comes with 99% accurate handheld GPS locators which is perfect and enjoyable to you. Here you also get-


  • Operating System: Zepp OS
  • Material: Aluminum alloy, Stainless steel
  • Water-resistant: 50 m
  • Display: OLED
  • Special feature: Universal
  • Heart-rate Monitor: Yes
  • Compatible Device: Smartphone
  • Screen Size: 1.43 Inches
  • Department: Men’s
amazfit gtr 4 Smartwatch

Lucrative Design

This watch is a passion for the younger to old people. They love this watch to wear for lucrative designs. And it is worth mentioning that here you get an anti-glare technology base finish with a glass bezel cover.

Besides this, the watch comes with a 1.43″ AMOLED display which is huge, and enough to observe.

Durable Materials

This one is made with durable materials like silicone, aluminum alloy. Amazfit uses anti-finger print coatings to keep the watch looking pristine.

Along with this, the watch is eligible for those who are too fashion conscious. It’s because you will get an aluminum alloy frame with a stainless steel navigation crown.

Private & Accurate Health Technology

This watch is manufactured with a new additional technology named BioTracker 4.0 PPG biometric sensor.

This technology will be enhanced to 2LED, enabling collection of 33% more data than its previous rivals. So here you get facilities like tracking 24-hour heart rate monitoring, blood-oxygen saturation, stress recording etc. You can also check your breathing rate.

Actually it is an important health metrics watch that can produce all kinds of data at one tap.

Online & Offline Voice Assistant

This watch will let you receive calls, send voice messages on different social media like Facebook, Instagram, Twitter, etc. Even though you can use this voice assistant app offline beside online.

Fall Detection

We must say it is a great feature of the Amazfit watch. This watch has an excellent Fall detection capacity when you’re in trouble.

Actually, fall detection means when you’re accidentally fallen from any hills or during the cycling period, the watch will automatically call the emergency contact.

Or trying to contact anyone whom you know best to send a distress message containing location information. All of these are done by OTA update. To start this option, you need to set the watch in the Zepp App.


  • The watch is very sturdy and delivered by a secure packaging
  • Very lightweight, comfortable and extreme durable to wear
  • Suitable for high quality workmanship
  • All the apps are running properly and adequately
  • Many sports apps, workout, can be set and enjoy without any trouble


  • Its battery life is a bit annoying
  • The Apps are often delayed to start working due to software issues

4. Best for Tracking: Apple Watch Series 8

Although there are numerous high-quality smartwatches on the market, many individuals, especially iPhone customers, insist that Apple makes the greatest devices.

Apple Watch Series 8 is the newest and most advanced version of the company’s standard watch. Take a look at one of the top watches featuring an Oxygen Sensor, the Apple Watch Series 8:


  • OS: watchOS 9.0
  • Processor: Dual Core S8 processor
  • Style: GPS + Cellular
  • Material: Glass front, ceramic/sapphire crystal back, stainless steel frame
  • Display Type: Retina OLED
  • Display Size: 41mm/45 mm
  • Sound: Loudspeaker with no headphone jack
  • Battery: Li-Ion 308 mAh. Up to 36 hours in Low Power Mode
  • Water Resistance: WR50 rating up to a depth of 50 meters
Apple watch series 8

Oxygen Sensor

The amazing Series 8 sensor and software let you take observations of your blood oxygen levels whenever you choose, day or night. This sensor eliminates the need for a separate oximeter and makes it simple for users to assess their blood’s saturation level.  

There is little to no difference between the readings produced by the wristwatch and the authorized medical oximeter, therefore the result you obtain is highly trustworthy.

Other Health Monitoring Features

If you have an Apple Watch Series 8, you may get valuable insights on your wellness. The new Series 8 Apple Watch has a temperature sensor that monitors your body while you sleep, allowing you to see trends over time.

The Sleep app does more than simply monitor your sleeping habits. Time spent in REM, Core, and Deep sleep stages, as well as possible wake-up times, are all shown. Series 8 Apple Watches may produce an electrocardiogram (ECG) that is identical to a one-lead ECG when using the ECG application.

Build Quality and Reliability

The Apple Watch is technologically and aesthetically ground-breaking. The watch face is a standout among fashionable timepieces. In addition, the watch’s stainless-steel construction makes it very long-lasting.


  • Able to Detect Oxygen Levels in the Blood
  • The findings of oxygen measurement in the blood are reliable
  • Powerful screen and streamlined design
  • Improved safety measures
  • Supports making and receiving calls and text


  • Sleep tracking results may be unpredictable
  • A minor upgrade


  • Physical Size: 4.69 x 4.69 x 3.15 inches
  • Battery Life: Up to 45 days
  • Weight: 113 grams
  • RAM: 1GB
  • ROM: 8GB
  • Display Type: AMOLED
  • Screen Size: 1.39 Inches
  • Compatible Devices: Smartphone
  • Operating System: Wear OS
  • Connectivity: NFC, GPS
TicWatch Pro 3

Oxygen Sensor

The TicWatch Pro 3 features an incredible option that is an oxygen sensor. It can, without any interruption, measure your blood saturation level. It means there is no need to get an oximeter. It can measure the blood saturation level greatly; however, using it for medical purposes is not ideal.

Because it can give an approximate result and not the exact results every time, you can still rely upon it since it can show results that have less difference than the certified oximeter. It will not cause you trouble in providing continuous results. Also, you are assured of getting the measurement of heart rate too.

For healthy daily tracking, the watch would work extremely well. It will help you be careful about the oxygen level in your blood. When you can get the right track of the oxygen level in your blood, you can understand what you should do to keep it on the safe track.

Design and Quality

It comes with a premium design. The high-quality stainless steel bezel and AMOLED screen give the watch a stylish-looking appearance. Moreover, it ensures the timepiece’s durability. The dual-layer display of this model lets you read through the screen effortlessly.

Choose any stylish watch face from the store from thousands of varieties. The whole outline of the watch is cool enough to match with any outfit you wear.

Health Tracking

One of the important features of a smartwatch is fitness tracking. With the help of this feature, you are always notified about how good your health is. This powerful premium timepiece can track your sleep and stress level.

So, you can sleep well and stop worrying, and after waking up see for yourself how good your sleep was. Knowing your stress level will help you do things that can reduce the stress in you. Over ten different workout modes are added to help you perform them well and keep knowing about your health progress.


  • Prolonged battery life
  • Unique yet stylish design
  • Blood saturation level measurement
  • Durable and waterproof
  • Helpful various sports modes


  • The watch gets damaged if used under a hot shower

Related Post: Ticwatch Pro 3 GPS Smart Watch Review


  • Physical Size: 1.59 x 1.4 x 0.41 inches
  • Weight: 31 grams
  • Connectivity: GPS, Bluetooth
  • Display Type: AMOLED
  • Battery Service: Up to 14 days
Amazfit GTS 2 Mini

Oxygen sensor

Amazfit GTS 2 Mini Fitness Smart Watch comes with a very reliable oximeter sensor. The sensor allows you to track the oxygen level in your blood. Of course, as the watch is sensor-based and provides data depending on the sensor, the result you’ll get will not be 100% accurate. But at this price point, you’ll get pretty reliable results.

As you can measure blood oxygen levels instantly after a gym session, you can make your wrist steady and perform this test. After performing the test, the results will show you how well you are performing. If you want, you can even track your blood oxygen level at night while you are sleeping. Then, you can see the data in the morning.

The SpO2 sensor makes this watch more useful than most of its rivals. Furthermore, you can perform this test in a very speedy way, and the result will be nearly exact as a certified oximeter. So, you are getting a better watch at a very reasonable price with an oximeter sensor.

Fitness tracking

The watch can easily monitor your heart rate, and when it sees any irregularity it instantly alerts you so that you can take early precautions, and improve your better health. In addition, it can count your steps. So, you can see on your watch how many steps you have walked and how many calories you have burnt. It is also capable of monitoring your sleep quality. So, floor the watch instruction, and you’ll get a sound sleep.

Additional features

It comes with a built-in Alexa. Alexa is a voice assistant, and you can command the watch by voice. So using your voice, you can do all tasks hands-free, like setting the alarm or timer. You can also make or receive calls on this watch. So. It is a feature-rich watch with all types of necessary features on your wrist.


  • Instant blood oxygen level measuring  
  • Fashionable look 
  • Can monitor heart rate 
  • Sleep tracking 
  • Stress level measurement 


  • Results are not very accurate

Read Next: Best Amazfit Smartwatches Review


  • Screen Size: 1.43 Inches
  • Physical Size: 1.61 x 1.39 x 0.44 inches
  • Connectivity: GPS
  • Weight: 30 grams
  • Water Resistance: 50 meters
Amazfit Bip U Pro Smartwatch

Oxygen sensor

Amazfit Bip U Pro Smartwatch comes with so many exciting features and among those one of the most important features of fitness tracking is the capability of measuring blood oxygen levels. Using some sensors, the watch can blood the amount of oxygen flowing in your blood.

The result this watch provides is not 100% accurate so you should not expect the same result from this watch as you get with an oximeter. But the results are not offbeat, most of the time you’ll get close results on both devices. So for tracking blood oxygen levels at any time this smartwatch is a great option.

If you are feeling unwell or under stress, you can instantly perform a blood oxygen level on your watch and get a better understanding of your physical health. This feature is very handy while you are working out in the gym and after gym sessions measuring the blood oxygen saturation gives you a better understanding of your condition.

Fitness tracking

The watch monitors the heart rate 24/7. So, it constantly monitors your heart rate and if the watch sees anything offbeat it will instantly notify you through an alert tone. Also, it is capable of tracking your sleep quality and stress level. In all, the watch got you covered and you can improve your health with the help of this smartwatch.

Additional features

The battery life of the watch is extremely good and you can pass a whole vacation of 5-7 days on a single full charge. So, no more worry about charging the watch daily. The watch is capable of making calls and receiving as well. It also has an in-built GPS for better location accuracy.


  • Blood oxygen level measurement
  • 50meters water-resistant
  • Heart rate and sleep monitoring
  • Can monitor the stress level
  • Built-in GPS


  • Not so-reliable blood oxygen measurement results


  • Physical Size: 11.54 x 2.36 x 1.22 inches
  • Weight: 99 grams
  • Connectivity: GPS, NFC, WIFI, Bluetooth
  • Case Diameter: 46mm
  • Water Resistance: 50 meters
SAMSUNG Galaxy Watch 4 Classic

Crush your health and exercise goals with this smartwatch. The Samsung Galaxy Watch 4 Classic can help you push yourself to the highest level you want.

Oxygen Sensor

Among the few Samsung smartwatches, Galaxy Watch 4 Classic has an excellent oxygen sensor feature. It’s too easy to operate. Whenever you activate the blood oxygen measurement feature, it will collect data and show you the results on the screen.

Fitness Tracking

When it’s to fitness tracking, this wristwatch has advanced features. It includes 6 famous exercises required for creating a fit body. Those workouts include running, swimming, rowing, etc.

Additional Features

Other great features of the watch are EGG and Sleep tracker. Electrocardiograms will collect signals from your heart to tell you the conditions of your heart.

Also can’t help mentioning the sleep monitoring. It will check the stress level to show you whether or not you had the right amount of sleep.


  • Tactile Design
  • Excellent performance
  • Feature-packed
  • Improved Wear OS
  • Durable Body


  • Pricey

Read Next: How to fix if Samsung Galaxy Watch screen doesn’t work


  • Physical Size: 1.9 x 1.9 x 0.54 inches
  • Weight: 51 grams
  • Connectivity: GPS, Bluetooth
  • Battery Service: Up to 14 days
  • Display Resolution: 240 x 240 pixels
Garmin Forerunner 945

The Garmin Forerunner 945 was specially made for athletes. This is considered one of the best intelligent wearables for running and blood oxygen measuring.

Oxygen Sensor

The watch comes with an advanced-level oxygen sensor. It has a pulse oximeter that continuously calculates your oxygen level in the blood. It will also provide you with the score of oxygen saturation level in blood.

Fitness Tracking

What can be more soothing than exercising while listening to your favorite playlist? It’s now possible with Forerunner 945.

It offers you a Premium GPS through which you can track distance, and the timepiece will also inform you more about running.

Additional Features

The most helpful additional feature of this wristwatch is the tracking system. It’s so advanced that you don’t have to worry about your safety when working out.

No matter wherever you get it, the smartwatch will show you the exact location you’re at, and you can always find your contacts on the watch through your smartphone.


  • Thin profile
  • Fully featured
  • Comfy
  • Intuitive
  • Prolonged battery


  • It can’t work well with the third-party applications

Read Next: Best review of Garmin Forerunner 45


  • Physical Size: 1.59 x 1.59 x 0.49 inches
  • Weight: 30 grams
  • Department: ‎ Unisex-Adult
  • Battery Service: Up to 6+ days
  • Water Resistance: 50 meters
Fitbit Sense Advanced Smartwatch

Oxygen sensor

The Fitbit Sense Advanced Smartwatch is for those who are suffering from asthma or apnea. This cool-looking watch can measure oxygen levels in your blood while you are sleeping. So you can easily see the percentage of SPO2 in your blood. The watch collects data while you are asleep, and provides the result accordingly on your watch screen.

You have to download a watch face separately on that watch face, you will be able to see the SpO2 level. When you connect your watch with your smartphone, you can easily see a detailed analysis of your blood oxygen level on your smartphone very easily on the Fitbit app.

Oxygen level measuring is one of the features of this smartwatch, and it has just one sensor to measure the blood oxygen level. So the result the watch will provide surely will not be 100% accurate but what it gives is quite reliable and very close to oximeter results. So you’ll get a satisfactory result from this watch which is enough to let you know about your blood oxygen level while sleeping.

Fitness tracking

One job that this watch does perfectly is tracking your fitness. It has many features that track wellness, and if it has news of any irregularity, it alerts you immediately. In addition, the rate sensor of this watch works fine and provides very reliable results. Also, you can do ECG using this watch, and even that is very little time. So in the case of fitness tracking, the watch is very reliable and outstanding performing.

Additional features

The Fitbit sense comes with a built-in microphone and speaker. It also has GPS. You can easily attend calls and send texts using the watch without pulling the smartphone from your pocket. The GPS helps a lot while traveling, hiking, or biking somewhere. Overall, this watch is a great performance, and the oximeter of the watch is one of the best in the market right now.


  • Shows reliable oxygen level 
  • Can measure ECG 
  • Heart rate alarm 
  • 6 days+ battery 
  • Can attend calls 


  • Only measures oxygen saturation at night


  • Model: P22
  • Dimensions: 10.83 x 3.58 x 0.67 inches
  • Weight: 3.84 ounces
  • Battery: 1 Lithium Polymer battery
  • Battery Life: 10 days
  • OS: iOS 9.0
  • Compatible Devices: Smartphone
Popglory Smartwatch

Oxygen sensor

Many modern smartwatches can measure the amount of oxygen flowing through your blood but the sensor they used for measuring the data is not so advanced. But Popglory Smartwatch uses an advanced sensor to collect the data and the result you get is pretty accurate.

After a workout session or while feeling unwell you can instantly perform a blood oxygen measuring check while staying where you are. You just have to use the smartwatch that is on your wrist and you’ll get the result instantly. Blood oxygen saturation measuring is pretty handy for those who go to the gym daily.

This device is a smartwatch, not a medical device. So you should not compare the device with a medical device as well. As it is not a medical device you may think the result will be too offbeat but that is not the case. Its results are pretty reliable and you can record the data using just a simple mobile app.

Fitness tracking

Blood pressure measuring capability is a very necessary feature in any smart device and this watch uses advanced high-quality sensors to measure blood pressure. You can know your blood pressure instantly using just your smartwatch. It can also monitor your heart rhythm so that it can help you to stay fit and healthy. Sleep quality monitoring is another exciting feature of this watch.

Additional features

The built quality and the design of this watch are very stylish and durable. Even after rough use, the watch will surely serve you long. When it comes to battery life, what the watch offers is pretty amazing. You no longer have to charge the watch daily as the battery life is pretty solid. It will let you know about the weather, remind you about upcoming events, and many more things.


  • Advance sensor for blood oxygen saturation
  • Monitor heart rate
  • Can measure blood pressure
  • Touch screen
  • Long battery life


  • Not so-reliable results

Related Post: Review For Popglory Smartwatch


  • Physical Size: 1.65 x 1.37 x 0.39 inches
  • Weight: 43.9 grams
  • Display Type: LCD
  • Display Resolution: 240 x 240 pixels
  • Connectivity: GPS, Bluetooth
CanMixs Smart Watch

Oxygen Sensor

The exclusively designed CanMixs Smartwatch is accurate for wearing for both women and men. Especially people who love staying stylish will feel pretty wearing it. Coming to the point, it contains a fitness tracker through which you can know your blood oxygen level along with the different activities you do.

It shows correct results, and its O2 sensor can properly measure the level of oxygen in your blood. Its simple-to-understand chart display provides you with tracking the blood oxygen level and displays the data well organized on the screen.

Health Tracking

The smartwatch contains an advanced heart rate. With its help monitoring your heart rate every five minutes is an easy task. It will provide you with this service 24/7. Also, it lets you track the heart rate manually.

If you want to use the Hero band III app, you can get heart rates too. While you are sleeping, it can track how good you are sleeping and give you a chart over it when you wake up.

Additional Features

This amazing timepiece can impress you with its quick actions on additional features like getting notifications on calls and messages, controlling music, a Remote camera, and more. When your smartphone is having some issues, it will help you like your practical partner.

Get all your calls, phone messages, app messages, calendar alerts, email, etc., right over the timepiece screen. Its crystal clear display will give you the experience of easy reading through the display.

Check whether every day and control music with a few clicks. The best part of it is that you don’t need to busy your hands for taking a selfie; just open the Hero band III app on it and shake to capture lovely moments.


  • Comes with a remote camera
  • Provides necessary fitness trackers
  • Gets all the smart notifications
  • Comes with an eye-catchy outline
  • Displays easy to read and understand fitness chart on the screen


You can’t record any audio through the watch

Things to Consider While Buying the Best Smartwatch with Oxygen sensor

When choosing a watch with an oxygen sensor several things need to be considered. These things will help you to get much reliable performance and that will eventually help you to lead a healthier life.

Oxygen sensor

Here the oxygen sensor is the first priority so that is a must-have option in the smartwatch. What this option does is calculate the amount of blood flowing through your blood. Several different types of watches are available in the market with different functionalities.

Some watches can measure the blood oxygen saturation only at night and some can measure discontinuously. Also, some watches are capable of measuring blood oxygen instantly. So if you have respiratory system conditions you should go for a watch that is capable of measuring blood oxygen anytime.

Battery life

The battery life of any smart device is crucial, so is it for smartwatches. If you do not want to charge your smartwatch after every 2-3 hours of use, choose a smartwatch that comes with longer battery life.

Fitness tracking

Fitness tracking, heart rate monitoring, and measuring blood pressure is pretty important. You can perform these tests and get a better idea about your health condition. So choose a watch that is capable of doing these things.

What is a Pulse Oximetry?

Pulse oximetry is a non-invasive and rapid way to assess your blood’s oxygen saturation level. The word “non-invasive” means no part of your body is harmed in the process of obtaining a sample. Noninvasive simply implies that it does not break your skin. It can identify even slight variations in the amount of oxygen delivered to the limbs which are far away from the heart, such as the legs and arms, very quickly.

The purpose of this technique is to measure how efficiently the heart pumps oxygen throughout the body. Pulse oximeters are primarily utilized in healthcare facilities. 

What is the Origin of Pulse Oximetry?

The earliest oxygen saturation meter is thought to date from the 1930s when researchers investigated light transmission through skin and the data it may offer. 

During the 1960s and 1970s, people saw pulse oximeter devices evolve into the ones currently used in hospitals and may be purchased to perform those measures at home. Due to its massive size, Hewlett Packard was the first firm to develop an ear oximeter, primarily utilized in clinical sleep laboratories.

How does Pulse Oximetry Works?

Blood oxygen sensors employ light wavelengths to detect your hemoglobin, the oxygen-carrying protein particle in your blood. Depending on how much oxygen it carries, hemoglobin absorbs light of different wavelengths. The numerical measurement represents the proportion of oxygen in the bloodstream.

How does this technology work in Smartwatches?

This technology has been simplified and placed on the bottom side of smartwatches to align with your wrists. The rear of the watch has infrared, green, red, and infrared LEDs that glow through the blood circulation in the wrist.

The quantity of reflected light is then measured using photodiodes (electronics that transform light into electrical energy). A sequence of algorithms analyzes data using photodiodes to identify the color of the blood. Oxygen levels are likely to be low if the color of the blood detected is dark. 

What are The Necessity and Uses?

Our bodies require oxygen to function; it is sometimes referred to as the “critical gas” since our bodies cannot work correctly without it. Our lungs are critical because they allow us to breathe oxygen, which is subsequently combined into our blood and sent to our cells.

Whenever someone has any type of lung illness, their oxygen saturation levels drop, and doctors utilize Pulse Oximetry to detect whether or not they have a lung problem. Apart from a lung illness, physicians use this test to diagnose asthma, Pneumonia, lung cancer, anemia, heart attack, and other medical disorders that influence blood oxygen levels. 

In addition to medical purposes, this testing can be conducted by experienced mountain climbers. A smartwatch with a blood oxygen sensor integrated can tell you how the body is adapting to high altitudes. Helping you to keep track of alterations without having to carry extra weight.

What is The Optimum Oxygen Concentration in Blood?

The method of detecting oxygen saturation level with a pulse oximeter is known as “O2 Sat” in the medical field (SPO2). We will attempt to make the terminology as straightforward as possible. The recommendations below will assist you in determining your oxygen saturation level, including whether or not you should consult a doctor.

  • Saturation levels between 95 and 100 % are regarded as standard.
  • A saturation level lower than 95% is regarded as low. Consult a doctor right away if your oxygen saturation level is low. 

Acute Pneumonia is the most prevalent indication of Coronavirus infection. Patients with severe Pneumonia had oxygen saturation (SPO2) of less than 90% on room air, referring to the WHO interim Guidance paper on Coronavirus.

What is The Best Reading?

Ensure that adequate blood flows to the hand and finger where the oximeter is worn to achieve an accurate reading. You’ll obtain the optimal reading for your blood saturation levels if your hand is warm, relaxed, and placed underneath the level of the heart. 

There might be an issue with the sensor if you follow this advice and your pulse oximeter gives you incorrect results. You may well have your oximeter tested for correctness at your medical care provider’s office or a medical equipment firm. 

Following the purchase of your equipment, it is important that you properly test it. A malfunctioning sensor might give you inconsistent readings, leading you to make healthy choices you don’t necessarily need to make. This has the potential to go wrong. 

How Accurate are Finger Pulse Oximeters?

A pulse oximeter’s oxygen level is practically correct. Typically, oximeters provide you with a 2% higher or lower result than your saturation would be if you used an arterial blood gas. If your pulse oximeter shows 92 % oxygen saturation, it might be anything between 90 and 94 percent.

Give sufficient time (a few seconds) for the pulse oximeter to catch your pulses to acquire a decent reading properly. A pulse oximetry reading’s accuracy can be harmed by a number of variables, including:

  • Your hands may be cold.
  • You are not relaxed or restless. 
  • You have black, blue, or green nail paint on your nails. 
  • You have fake nails on.
  • Your oxygen saturation is extremely low, falling below 80%. 
  • You have thick skin. 
  • Pulse oximetry precision can also be influenced by skin color. Pulse oximetry may overlook below-normal oxygen saturations in people with darker skin pigmentation, according to recent research. Inquire with your physician about the reliability of your oximetry results if you’ve got a darker complexion. 
  • Your oximeter result may be greater than your actual oxygen saturation if you smoke. Smoking increases blood carbon monoxide levels, and an oximeter cannot differentiate between carbon monoxide and oxygen. As a result, the oximeter cannot provide an accurate reading.  

Before making any healthcare decisions, routinely check your oximeter readings with your physicians to keep your readings in check and what that information means. 

How Accurate are Smartwatch Pulse Oximeter Sensors?

Smartwatches and portable gadgets will play a significant role in the healthcare industry’s development, and we’ve heard of several incidents where smartwatches have saved lives.

However, the accuracy of SPO2 Sensors in Smartwatches, which reads SPO2 from the wrist, is not precisely accurate and depends on many variables.

Because smartwatches measure your SPO2 from wrists, factors such as complexion, body fat, blood flow, correct wear, and appropriate bands will impact the results.

Furthermore, unlike the VO2 Max test, which is done while you are exerting yourself, the SPO2 measurement must be conducted while you are completely motionless and at rest. Any activity or attempt made prior to or during the test will have a significant impact.

Such technologies should not be used instead of a medical examination. That stated you cannot entrust your life to them. Get medical assistance immediately if you have health issues or are anxious about your well-being.

Types of Smartwatches with SPO2 Sensors

There are two types of blood oxygen sensor smartwatches on the market now. One records SpO2 levels in real-time, while the other only monitors SpO2 levels at night. Each has its distinct characteristics. You can select any one of them depending on your needs. 

  • Smartwatch with real-time SpO2 Monitor

A smartwatch that monitors and records your SpO2 in real-time can enable you to keep track of your wellbeing at all times. Most contemporary SpO2 watches have an app that measures your oxygen content within 30 minutes.

Smartwatches with real-time SpO2 tracking include Samsung Galaxy Watch 3, Active 2, and Apple Watch Series 6.

  • Smartwatches with nighty SpO2

Night oxygen monitoring does not allow for on-demand SpO2 measurements. On a SpO2 watch face, these smartwatches measure oxygen levels overnight and display the average blood oxygen level.

Smartwatches with nighty oxygen, such as the Fitbit Sense and Fitbit Versa series, are less desirable for individuals who seek frequent readings to track their health more readily!

If you want a smartwatch that can test your blood oxygen level (SpO2) at any moment, search for one that has real-time blood oxygen functionality. However, because the measurements are averaged using the nighttime monitoring feature, the result of your blood saturation levels will be more accurate than a real-time reading.

Traditional Pulse Oximeters vs. Smartwatch with SpO2 Sensors

When compared to oximeters, measuring blood saturation correctly using a smartwatch is more challenging. You move a bit, or you are perhaps a little more relaxed than usual; a very faint signal might be received. The wrist is susceptible to blockages and inaccurate readings, unlike the fingers, which have many blood veins at the surface that provide a robust signal.

Another issue that consumers may have about these gadgets is whether or not the FDA has approved them. Although many of the Oximeters finger pulse brands are certified by FDA (such as Medline), the FDA is not authorized for any Smartwatches.

These are some of the top smartwatches and gadgets on the market, including not just blood oxygen sensors but also a range of additional features that may help you in your everyday activities.

Should I Buy a Smartwatch with Oxygen Sensor or not?

This, of course, is contingent on your preferences. If you’re seeking a reliable Pulse Oximeter for healthcare use, Medline has a 50-dollar Finger Oximeter that is FDA approved. 

If you desire a Smartwatch because of the many functions and entertainment it provides, as well as reliable SPO2 readings (particularly as an overnight measuring device), then go for it. 

Furthermore, many customers have reported precise SPO2 readings from the watches (including real-time checks), so it’s possible that it could serve you if you wear it firmly enough.

An excellent option would be to get a $20-30 reliable finger pulse oximeter from Amazon and make comparisons with your watch. If they match the majority of the time, your watch is working well for you, and you can now enjoy a pleasant night’s sleep while recording your SPO2.

Frequently Asked Question (FAQ)

What are the symptoms of a lack of oxygen?

If you’re experiencing symptoms like breathing difficulties, headaches, uneasiness, fast breathing, chest discomfort, disorientation, or elevated blood pressure, you may have low oxygen levels in the bloodstream.

What are the Methods of Measuring blood oxygen level

Two sorts of techniques are commonly utilized to determine blood oxygen saturation levels. 

  • SPO2: Peripheral Oxygen saturation (SPO2) – It’s a non-intrusive, indirect method. In this technique, we use a pulse oximeter.
  • SAO2: Arterial Oxygen Saturation (SaO2) – It’s a straightforward yet intrusive method. Doctors utilize a blood test called an “Arterial blood gas study (ABG)” to determine the oxygen level in your blood in this approach.

The SPO2 sensor is used in sophisticated smartwatches, and it aids in determining the degree of oxygenation in your blood.

Can anxiety cause low blood oxygen levels?

When you’re stressed, your body tenses up, and you start breathing excessively. A short breath lowers blood oxygen levels, something that the brain perceives as a source of stress. Breathing gets a little quicker and faster at this point. The proportion of oxygen in the air gradually diminishes. 

When using a pulse oximeter, which finger should I use?

According to research, the middle finger on your right hand produces the most satisfactory outcomes. Remove any nail paint before using, and prevent using on cold fingers since the readings may not be accurate.

Without an oximeter, how do you monitor your oxygen levels?

For 1 minute, maintain your hand on your chest and assess your breathing rate. Your oxygen level is appropriate if your breathing is below 24 per minute. The oxygen level is low if a patient takes more than 30 breaths per minute.

What is a typical concentration of oxygen during sleep?

A saturation level of above 95% is deemed appropriate. If your blood oxygen level drops below 92 percent, it could indicate that you were having breathing difficulties during sleep. You should seek medical advice in that case as you may have sleep apnea or some other disease such as severe snoring, COPD, or asthma.

Final Words

Smartwatches are working continuously to make our life easier and help to improve our health conditions. Blood oxygen measuring is a newly introduced feature in smartwatches that helps to measure the blood oxygen saturation and lets you know about your health deeply.

Performing this test after a gym session or while at a high altitude will help you to know your condition better. The result you’ll get is also very reliable. The list of our best smartwatches with oxygen sensors will help you to perform blood oxygen saturation tests and give you very reliable data.

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Nick Rolloson
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