The Ultimate Guide to Using Your Smartwatch for Blood Oxygen Level Monitoring Throughout the Day

Best 12 Smartwatches With An Oxygen Sensor (SPO2) In 2024

If you are looking for a smartwatch or fitness tracker with a built-in pulse monitor, you have come to the right place. Most smartwatches and fitness trackers have an optical heart rate monitor built-in. In this article, we will be looking at some of the best smartwatches and fitness trackers that have a pulse oxygen monitor(pulse oximeter) sensor built-in as well.

Blood Saturation became a parameter in discovering the Coronavirus in our bodies, the truth is that many smartwatch and fitness trackers manufacturers had incorporated Oximeters(Oxygen sensors/monitors) in their watches and fitness trackers long before this Virus has shown up.

How accurate are the Oxygen monitors in Smartwatches and fitness trackers? Can I trust them As A Medical Device? Are they FDA-approved? I will discuss these important topics in this post.

Covid_19 has already affected more than half a million people around the world and it is spreading rapidly. So, far it has spread to more than 199 countries around the world and many countries have announced medical emergencies and Lockdowns to stop the spread of this novel coronavirus. The good news is that these steps have helped the governments to flatten the curve to some extent but still, WHO, CDC, and other Health agencies recommend taking extreme caution to avoid the infection.

The Coronavirus (SARS-CoV-2) attacks the lungs and causes severe pneumonia which makes it difficult for the victim to breathe. According to WHO, a low Oxygen saturation level could be a sign that you possibly have the Covid_19 and you should seek medical assistance.

Apart from the Coronavirus, Oxygen Sensor can also help you find sleep Apnea which is a very serious sleep disorder and it can help you with your training progress as well. Here is a Short video Explanation by Garmin

In this comprehensive guide, I will share everything you need to know about Blood Oxygen levels. I will also share some of the best Smartwatches and wearables which can help you determine your Blood Oxygen level. Lets get into it.

Best Smartwatches And Fitness Trackers With An Oxygen Sensor(SPO2)

What is Pulse Oximetry?

Pulse Oximetry is the technique to determine oxygen saturation (SO2). Pulse Oximeters are mainly used in clinics and Hospitals. Pulse Oximeter, as it sounds, is a combination of a pulse meter and an Oximeter.

When it comes to finding oxygen saturation, there are two types of methods that are mainly used.

• SPO2 Peripheral Oxygensaturation (SPO2) It is an indirect and non-invasive approach. In thismethod, we use the pulse Oximeter.
• SAO2 Arterial OxygenSaturation (SaO2) It is a direct but invasive approach. In this method, thedoctors use the blood test known as Arterial blood gas study (ABG) to knowthe oxygen saturation level in your blood.

Modern Smartwatches come with the SPO2 sensor which helps them determine the Oxygen saturation in your blood level.

Now, you must be wondering how Pulse Oximeter works. According to the American Thoracic Society:

A Pulse Oximeter comes either as a small unit with a built-in finger/toe clip or a small handheld device that has a probe that can attach or be applied to your finger, toe or earlobe A beam of light from the device passes through the blood in your finger (earlobe or toe) to measure your oxygen.

The smartwatches work the same way as the simple finger clip only that they send the beam of light from your wrist instead of your finger.

When it comes to Pulse Oximeters, they show blood saturation in the form of a percentage. However, it can also vary from vendor to vendor. For example, Fitbit shows the oxygen saturation level in the form of a graph which well discuss later in the article.

Looking for a Smartwatch that can monitor blood pressure? check out my post on the Best 5 Android Smartwatches with ECG Monitoring that are FDA Approved.

Why Do We Need it and Who Uses It?

Pulse Oximeters (Oxygen Sensors) are used by doctors to determine the oxygen saturation level in the patients blood. Oxygen is very important for our body, you can consider it as a crucial gas and our body cant function without it.

Our lungs play an important role as they allow us to inhale the oxygen which gets mixed into our blood and then passes on to our cells.

When a person gets any lung disease, the oxygen saturation levels get low and doctors use Pulse Oximetry to determine if the person has a lung issue or not.

Apart from lung disease, doctors also use this test for various medical conditions which can affect the blood oxygen levels such as asthma, pneumonia, lung cancer anemia, heart attack, and others.

The Optimal Blood Oxygen Level

In the medical world, the process of measuring oxygensaturation level using the pulse Oximeter is known as O2 Sat (SPO2). We willtry to keep the terms as simple as possible and the following guidelines willhelp you determine your oxygen saturation level and whether you need to contacta doctor or not.

• If your reading is between 95 and 100% then it is completely normal.
• If your reading is below then 95%, it is considered low and you should get in touch with your doctor.

In the case of Coronavirus, Severe Pneumonia is the most significant symptom. According to the WHO interim Guidance document for Coronavirus, patients with severe pneumonia have oxygen saturation (SPO2) of less than 90% on room air.

How Accurate are The Finger Pulse Oximeters?

According to the American Thoracic Society

The Oxygen level from a finger pulse Oximeter(the ones that are being used at medical facilities) is reasonably accurate. Most finger Oximeters give a reading 2% over or 2% under what your saturation would be if obtained by an arterial blood gas (ABG).

The same document also mentions that The Oximeter reading may be less accurate if a person is wearing nail polish, artificial nails, has cold hands or poor circulation.

These are the different factors that affect the accuracy of Finger Pulse Oximeters.

How Accurate are The Smartwatches Pulse Oximeter Sensors? Can I Count on them in my life?

Although Smartwatches and wearable devices will play a huge role in the future of the medical industry, and we read about lots of cases in which Smartwatches helped to save lives.

When it comes to SPO2 Sensors in Smartwatches, meaning that they are reading the SPO2 from the wrist, their accuracy is not that great and it depends on many factors.

You see, Smartwatches are measuring your SPO2 from your wrist, therefore variants like skin tone, fat levels, blood vessels, proper wearing, and proper straps will affect the readings.

In addition, in opposite to the VO2 Max measurement which measures your blood oxygen in an effort, the SPO2 measurement must be taken while perfectly still and while resting. Any movement or effort before or during the test will affect it tremendously.

That being said, no, you cannot trust them with your life. If you have medical problems or you are not sure about your health, consult with a doctor. These gadgets are not a replacement for medical checks.

Measuring blood Oxygen: Finger vs wrist

These words by Fitbits director of research, Conor Heneghan will summon it up for you:

Its a pretty hard technical problem to measure SpO2 on the wrist, Unlike fingers, which have many blood vessels near the surface that offer a strong signal, the wrist is prone to obstructions and poor readings. You move a little bit, or even just you are a little bit colder than normal, you can get a very weak signal, Heneghan said. Weve gone after long-term averaging, so that way, when we take overnight measurements, we can comfortably exclude the periods when we feel that signal is too noisy or weak to be reliable.

This is the reason why the Fitbit, in opposition to the Apple Watch 6 that performs spot checks while you sleep, will only measure your SPO2 levels while sleeping and will give you an overnight review.

Are Pulse Oximeters on Finger and on Smartwatches FDA Approved?

While many of the finger pulse Oximeters brands are FDA approved(Medline for example), none of the Smartwatches are FDA approved.

So, If I cannot really Trust their Accuracy, Should I Buy A Smartwatch With An Oxygen Sensor?

Well, that depends on your expectations. If you are looking for a trustful Pulse Oximeter for purely medical reasons then you can buy a 50$ Finger Oximeter from Medline which is FDA approved.

If you want a Smartwatch for the tons of features and the fun that it brings and SPO2 readings that are quite accurate(especially as an overnight measurement device) then sure, go for it, Smartwatches are great.

In addition to that, many users are reporting accurate SPO2 readings from the watches(even the spot-on checks) and it could be that it will work fine for you(providing that you wear it tight enough).

A good solution might be to buy an additional 20-30$ accurate finger pulse Oximeter on Amazon and compare it with your watch.

If they are matching most of the time then you will know that your watch works fine for you and you now can have a good sleep and SPO2 tracking.

Here is a related post that I have written that might interest you about the Best 5 Wearable Blood Sugar/Glucose Monitor Devices.

Can Garmin measure Blood Oxygen And How accurate is It?

Garmin is one of the most popular companies out there and the company has introduced its Oxygen Sensor Pulse Ox in their Smartwatches and fitness bands.

The main purpose of this sensor in Garmin watches is to detect Sleep Apnea which is a sleep disorder and 8 out of 10 people who suffer from this problem dont know about it.

The Garmin Pulse Ox sensor monitors the blood oxygen level and then you can use the data to know if you have this problem or not.

Garmins watches, like the Apple Watch 6, allow you to perform a spot on check-in which you will require to stay still for 30 seconds. It also performs overnight tracking.

When it comes to accuracy, the official FAQ section does mention that [Accuracy] can be influenced by Altitude, activity and an individuals health. The section also states that if your Pulse ox during sleep reading seems slow then it could be due to incorrect posture. The website recommends to main a position that is conducive to good circulation and at or around heart level.

Can Fitbit measure Blood Oxygen and How Accurate Is It?

Some Smartwatches and fitness bands by Fitbit(mentioned in the list below) also come with the SPO2 sensor which is mainly focused on the Sleep Apnea problem. Instead of showing the percentage, Fitbit shows the Estimated Oxygen variation in the form of a graph.

The graph highlights the big variation in the graph that could be a potential sign of an issue. However, it is not an actual SPO2 Estimate.

According to Dr. Conor Henenghan, Fitbits Lead Sleep Research Scientist, We are not claiming this [graph] can be used to correlate with sleep apnea status This graph is another opportunity for us to provide more data to our users.

He also said, Seeing frequent big variations is a clue that you may be experiencing breathing during sleep something you might want to talk to your doctor about.

How accurate is Withings Pulse Oximeter?

Withings also has recently launched the ScanWatch which isalso focused on Sleep Apnea. It comes with the SPO2 sensor which can monitorthe blood oxygen level and provide alerts of any potential problems. It iscurrently waiting for clearance by the FDA.

Can the Apple Watch measure Blood Oxygen?

Yes, the new Apple 6 does come with a Pulse Oximeter. As I have mentioned above, The Apple Watch 6 is able to perform spot-on checks which will require you to stay very still for 15 seconds and overnight measurements.

For previous Apple watch versions, you can find in the App Store a dedicated Pulse Oximeter app that uses the camera to detect pulse and Oxygen levels from your fingertip.

However, the app mentions that The Pulse Oximeter app is not intended for Medical Use and is only designed for general fitness and wellness purposes. This option is very inaccurate and I would not recommend using it.

Is there a Xiaomi watch with Oximeter?

Xiaomi offers tons of great smartwatches, but only very few of them come with a built-in Oximeter (SPO2 Sensor). The first Xiaomi watch that comes with Oximeter is the Xiaomi Mi Watch. The premium smartwatch by the company offers a full-fledged and functional SPO2 Sensor that you can use to keep track of your blood oxygen levels.

If you want something affordable from Xiaomi and still want the Oximeter, you can consider Mi band 6, which also comes with a built-in SPO2 Sensor.

12 Best Smartwatches & Fitness Trackers with an Oxygen Sensor

If you have read down to this then you already know much about the Oxygen Sensors. In this section, we will share the 12 Best Smartwatches & Gadgets with an Oxygen Sensor.

Products Information:

The solar-powered multi-sports watch tracks your overall health and fitness. And you can navigate outdoor movements through preloaded maps and built-in GPS.

Included Pulse Oximeter keeps tracking your blood oxygen level. Also, theres a sensor to measure your HR all along. Your sleep, workouts, stress, workloads everything gets recorded with the readings.

Dont forget the advanced PacePro to get training guides. Its likely to help you with fixing the proper fitness exercises. Payment, music, storage, notifications, texts, streaming everythings right here.

Theres an altitude acclimation with its internal functionality. And the Li battery can keep working for 21 days in normal mode. You can count extra 3 days with solar energy.

Products Information:

The Fitbit Charge 4 is an excellent fitness tracker with an oxygen monitor. For the first time, the Fitbit Charge lineup includes an oxygen monitor, which makes it a great choice for serious athletes and fitness enthusiasts.

The Charge 4 offers all the standard features of the Charge 3, including heart rate monitoring, step counting, sleep tracking, and calorie burn estimation.

Whats more, Fitbits smartwatch app is excellent(my favorite one) and the Charge 4 includes a built-in GPS.

The predecessor to Charge 4 also has many convenient features to offer. Allow the built-in GPS to measure your covered distance and pace every time.

Integrated SpO2 keeps tracking your oxygen level in the blood. You can measure an average during nap time, workouts, and trends. Looking into the readings from the week should keep up the pace.

However, HR monitoring is more active with a 24/7 functionality. Also, you can check the burnt calorie and skin temp variations. Overall readings can help you set the perfect fitness management.

There are more than 20 goal-based workouts included for your fitness tracking. Meantime, the multi-day battery is ready to serve your needs for 7 days. And all this at a very reasonable price.

Products Information:

Time to optimize your fitness backed by the simple yet enthusiastic wearable. Fitbit gets you a reliable Daily Readiness Score to adjust your regular fitness activities.

Keep checking your health metrics dashboard for the essential readings. Built-in SpO2 tracks your blood oxygen against the almost-precise HR. Also, you can look into variations taking place on other metrics.

An additional EDA sensor lets you know the daily stress score for proper management. Youll have a six-month free membership as well. So, dont miss the advanced physical analysis from the measurements.

Focus on your necessary workout or post-injury recovery with real-time detection. And the colorful touchscreen with a powerful battery should support you for a week.

Products Information:

Garmin Vivosmart 4 is a fitness band that comes with the SPO2 sensor which can help you know your blood oxygen level. Its waterproof design allows you to use it in the office, gym, pool, or anywhere else you want to use.

The variety of colors makes it easier to pick the color of your choice. If you are looking for an accurate fitness band then Garmin Vivosmart 4 is a great option.

Products Information:

Garmin Fenix 5X Plus is a premium smartwatch that also comes with the Pulse Ox sensor which not only accurately analyzes the sleep quality but also measures oxygen saturation.

It is a premium watch so it comes with a beautiful design and tons of great features. It is another very solid option for you.

Products Information:

Garmin Vivoactive 4 is a mid-range smartwatch that comes with the Pulse Ox sensor to measure oxygen saturation. It also comes with 5 ATM Water resistance, Garmin Pay, Respiratory tracking, and other advanced features.

If you are looking for a solid watch in the mid-range segment then Garmin Vivoactive 4 is a great option.

Products Information:

Fitbit Versa Lite Edition is a versatile smartwatch that comes with tons of great features. It also comes with an oxygen sensor that accurately measures the blood oxygen level.

It is also available in multiple colors which makes it easier for you to pick the color of your choice. It is also very affordable considering the features you get.

Products Information:

With so many advanced features, the Forerunner 245 running watch makes it ideal for runners of all levels. With blood oxygen measurement (Pulse OX) measurement, pulse, built-in GPS, VO2 Max, running dynamics analysis, and more, users can enjoy a close-to-wrist training program, analyze performance, get information on recovery times, and get better.

Similar to the more advanced models in the series, Forerunner comes in 2 versions of Forerunner 245 and Forerunner 245 Music to enjoy music while running without the need for a mobile phone, with up to 500 songs storage space and connectivity to popular music services, including Spotify and Deezer.

In addition, the watch also offers the option of sending an SOS distress signal for location sharing when in trouble with selected contacts. Forerunner 245 has long battery life, up to 7 days in smartwatch mode and up to 24 consecutive hours in GPS mode or 6 consecutive hours in GPS mode with music.

Products Information:

The Elite Multi-Sports Watch offers a perfect fit for runners, riders, swimmers, or in short triathletes. The Forerunner 945 will guide the user in any sporting activity and help monitor particularly advanced physiological characteristics, maintain training load balance, analyze performance history, and more.

Alongside the familiar and beloved features of the GARMIN multisports watches, the Forerunner 945 is equipped with new and essential features that have so far been the exclusive possession of more expensive models, including a powerful battery, GPS reception from 3 satellites including GALILEO for fast and stable spotting, fast-dialing SOS emergency service for a predefined number during distress, measuring Pulse Ox blood oxygenation and, for the first time, direct listening to music with up to 1,000 songs storage and connecting to popular music services, including Spotify and Deezer.

Products Information:

Fitbits new smartwatch supports Alexa, Amazons Virtual Assistant, and features a range of features that are expected to be quite attractive to sports fans: a 24-hour pulse meter monitoring, sleep monitoring, and water resistance up to 50 feet deep, enabling monitoring of the users swimming abilities.

In addition, the Fitbit Versa 2 features over 15 different fitness modes with automatic detection and tracking (running, swimming, cycling, and more), the ability to monitor menstrual periods for women, and lets you create personalized reminders for exercise.

The device includes a pedometer and distance meter, the possibility to monitor the users climbed floors during the day, and a 3-axis accelerometer.

It also incorporates a Blood Oxygen Meter (SpO2), a built-in microphone to make calls, Bluetooth and WiFi support, an altimeter, and more.

The Fitbit Versa 2 battery life will last 5 days on one charge, at least according to the American manufacturer. The watch supports both iOS and Android users and comes with a dedicated silicone strap of various sizes.

Products Information:

As the latest smartwatch to arrive on the scene, the Galaxy Watch 3 is designed to be a perfect companion for your active lifestyle. This model is not only the perfect smartwatch for those of us with an active lifestyle but also is one of the best smartwatches for anyone looking for an oxygen monitor smartwatch. (The Wear to Track community gave this watch 4.4 out of 5-star reviews, with the only complaints being about the price.)

The Samsung Galaxy Watch 3 is the most complete health and fitness smartwatch. It has everything from step tracking, sleep monitoring, heart rate monitoring, GPS, NFC, ECG, and much more.

It combines a stylish, full-color touchscreen with a sporty design. It features a high-capacity battery that works for up to 3 days and a rugged body thats water-resistant to 50 meters.

Samsung Galaxy Watch 3 is the first wearable device from Samsung to have an oxygen saturation level monitor making it the ultimate fitness partner for those interested in keeping and tracking their oxygen saturation. The heart rate monitor accurately measures the heart rate in the wrist throughout the entire day. It gives you instant access to the heart rate at any time. Meanwhile, your heart rate zone is also displayed.

Products Information:

The much-anticipated Galaxy Watch 4 Classic is loaded with fitness-conscious features. You better get prepared to crush your wellness goals with proper body readings.

The featured SpO2 gets your blood oxygen level with advanced HR monitoring. You can effectively track your heart and lung conditions there. Patching with the Samsung Health app can reveal more info.

An automated workout tracker is enough to measure your activities and calories. Its luxurious design also includes advanced coaching with group challenges. And youll have everything to conquer the day.

An exclusive sleep monitoring feature can let you help with sound sleep. Meanwhile, almost every essential app is available with the watch to ease your lifestyle.

Frequently Asked Questions [ FAQs ]

Question: Can A Smartwatch Actually Measure Oxygen Levels?

Answer: Almost all major smartwatches have a particular SpO2 sensor to measure blood oxygen. You can even take readings during intense workloads or workouts.

Question: How Accurate Is The Oxygen Sensor In Smartwatches?

Answer: The practical measurement accuracy is 2% within 80% to 100% SpO2. However, the accuracy reduces to 3% when the SpO2 remains within 50% 80%.

Question: Can I Use A Smartwatch Instead Of An Oximeter For Oxygen Levels?

Answer: You should stick with an oximeter to use the reading for treatment purposes. Oximeter readings are more accurate compared to the sensory smartwatch.

Question: Why Do I Need To Measure The Oxygen Level?

Answer: Fitness-centered smartwatches offer various premium health metrics. And the suggesting calculations require your approximate blood oxygen level.

Bottom Line

Thats all folks. These are some of the best Smartwatches with an oxygen sensor. You can use these watches to get an idea about your blood oxygen level. However, these watches cant be a substitute for professional medical equipment. If you feel that you are not feeling well then make sure to contact the health helpline and get medical help.

If you have any questions, please let us know in the comment section below. Also, check out my post on the best Smartwatches with VO2 Max.

As a professional trainer and a gadget lover, Ive spent a lot of money and time buying wearable activity trackers, smartwatches, and gadgets, and checking them out. My site is focused on helping you with your activity tracking and smart technology journey. I try to provide the most helpful updated content on this subject. Hopefully, you will love my blogs and be a regular around here.