Blood Oxygen Level Apple Watch


Before 2020, you probably didn’t think much about your blood oxygen levels. Maybe there was a time you got sick or needed surgery, and a health professional clipped a sensor to your fingertip to test your levels. It’s likely you haven’t thought about those measurements since then.

Until this year, that is. COVID-19 has shown us how our lung health and oxygen levels are interconnected. And manufacturers of some of the latest fitness trackers are adding features that can measure blood oxygen levels. Here’s what you need to know.

The Blood Oxygen (SpO2) sensor can now read your SpO2 levels throughout the day. This provides another method for your Apple Watch to alert you if something is going on with your body that you weren’t aware of. All of this means that if you are interested in the SpO2 measurements, the Apple Watch Series 6 is the right Watch for you. ♥ 【 Heart Rate & Blood Pressure & Blood Oxygen Monitor 】- YAMAY 023 can accurately monitor this three body's most critical indicator of health.You can read them real-time directly on the watch, which can help you better understand your health and make reasonable adjustment on your life-style. The first time I tried this on the Apple Watch 6, it said my oxygen level was 88 percent — shockingly low, given that I am in good health and wasn’t wheezing. Five minutes later, I tested. Your blood oxygen level is a key indicator of your overall wellness. It can help you understand how well your body is absorbing oxygen, and the amount of oxygen delivered to your body. The remarkable new sensor and app in Apple Watch Series 6 allow you to take on-demand readings of your blood oxygen as well as background readings, day and night.

What does my blood oxygen level tell me?

Your blood oxygen level measures how much oxygen is circulating with your red blood cells. You can measure your blood oxygen level with a pulse oximeter. That’s a small device that clips onto your fingertip. It shines a light into the tiny blood vessels in your finger and measures the oxygen from the light that’s reflected back.


Your blood oxygen level is measured as a percentage—95 to 100 percent is considered normal.

“If oxygen levels are below 88 percent, that is a cause for concern,” said Christian Bime, MD, a critical care medicine specialist with a focus in pulmonology at Banner - University Medical Center Tucson. If you see readings at or below this level, you should contact your health care provider immediately or go to the nearest urgent care center or emergency room.

How does COVID-19 affect blood oxygen levels?

Some people with COVID-19 have dangerously low levels of oxygen. If you’ve been exposed to COVID-19, or you’ve tested positive but don’t have symptoms, there’s no need to check your blood oxygen level, Dr. Bime said. But if you develop symptoms, you might want to check your level. If it’s low or you notice it’s dropping, contact your healthcare provider.

Are there other times I should be checking my blood oxygen levels?

If you have lung or heart conditions, your doctor might want you to routinely check your blood oxygen levels at home. Dr. Bime said it’s recommended for people with:

  • Chronic obstructive pulmonary disease (COPD)
  • Congestive heart failure
  • Pulmonary fibrosis
  • Pulmonary hypertension
  • Cystic fibrosis

What causes low blood oxygen levels?

Different situations can cause low oxygen levels:

  • Pus, blood, or water filling the air sacs in the lungs
  • Blood clots in the lung
  • Scarring or loss of lung tissue
  • Sudden exercise, if you have heart or lung disease
  • Not breathing, in someone who is profoundly intoxicated, for example
  • Transitioning from low altitude, where the air has a high concentration of oxygen, to high altitude, where there’s a low oxygen concentration.

How can I check my blood oxygen level?

You have a few options. You can buy an FDA-approved pulse oximeter from a pharmacy or online retailer for $15 to $30. Dr. Bime recommends them for many of his patients with chronic diseases. He suggests people bring the devices to their doctor’s appointments to compare measurements.

Some of the latest wearable fitness devices can also measure your blood oxygen level—the Apple Watch Series 6 and certain Fitbit and Garmin devices track it through your wrist, and the Wellue Continuous Ring Oximeter takes readings from your finger.

They can be okay, with caveats. “There is a lot of variability in how these devices measure the oxygen levels, and these methods have not been cleared by the FDA,” Dr. Bime said. “As long as you compared the results to those from an FDA-approved device, they are fine.”

If you notice low oxygen levels on a fitness tracker, contact your healthcare provider for an evaluation. If your wearable device shows a normal oxygen level, but you don’t feel well, Dr. Bime still recommends getting evaluated by your doctor. “Do not be falsely reassured,” he said.

Measurements taken with the Blood Oxygen app are not intended for medical use and are only designed for general fitness and wellness purposes.

The Blood Oxygen app is only available in certain countries and regions. Learn where the Blood Oxygen app is available.

What is blood oxygen

Your blood oxygen level represents the percentage of oxygen your red blood cells carry from your lungs to the rest of your body. Knowing how well your blood performs this vital task can help you understand your overall wellness.

The majority of people have a blood oxygen level of 95 - 100%. However, some people live a normal life with blood oxygen levels below 95%. Slightly lower values while sleeping are expected, and some users might experience values below 95%.

How to use the Blood Oxygen app

Make sure that you meet the below requirements and follow the steps to set up the Blood Oxygen app.

Here's what you need

  • Make sure that the Blood Oxygen app is available in your country or region. You will be able to see this during the setup process.
  • Update your iPhone 6s or later to the latest version of iOS.
  • Update your Apple Watch Series 6 to the latest version of watchOS.*
  • The Blood Oxygen app is not available for use by people under 18 years old. You can confirm or set up your age in your Health Profile.

*The Blood Oxygen app is not available if you set up your Apple Watch with Family Setup.

Set up the Blood Oxygen app and background readings

  1. On your iPhone, open the Health app.
  2. Follow the onscreen steps. If you don't see a prompt to set up, tap the Browse tab, then tap Respiratory > Blood Oxygen > Set up Blood Oxygen.
  3. After you complete setup, open the Blood Oxygen app on your Apple Watch to measure your blood oxygen levels.

If you still don’t see the Blood Oxygen app on your Apple Watch, you can search the App Store on your Apple Watch for Blood Oxygen and download it.

The Blood Oxygen app is installed during the setup in the Health app. If you deleted the Blood Oxygen app, you can install it again from the App Store on your Apple Watch if you’ve completed the Blood Oxygen app setup.

How to take a blood oxygen measurement

You can take a blood oxygen measurement at any time with the Blood Oxygen app.

  1. Make sure that your Apple Watch is snug but comfortable on your wrist.
  2. Open the Blood Oxygen app on your Apple Watch.
  3. Stay still, and make sure your wrist is flat with the Apple Watch facing up.
  4. Tap Start, then keep your arm steady for 15 seconds.
  5. Wait. The measurement takes 15 seconds. At the end of the measurement, you will receive the results.
  6. Tap Done.

How to get the best results

  1. Rest your arms on a table or in your lap while you take a measurement. Keep your wrist and palm down and flat, and hold as still as you can.
  2. Make sure that your Apple Watch isn’t loose on your wrist. The band should be snug but comfortable, and the back of your Apple Watch needs to be touching your wrist.
  3. Make sure that the back of your Apple Watch is flush with the top of your wrist. If your wrist bones interfere with this, move your watch 1 to 2 inches up your arm away from your wrist bone.

Additional factors

Even under ideal conditions, your Apple Watch may not be able to get a reliable blood oxygen measurement every time. For a small percentage of users, various factors may make it impossible to get any blood oxygen measurement.

  • Skin perfusion (or how much blood flows through your skin) can impact measurements. Skin perfusion varies significantly from person to person and can also be impacted by the environment. If you are out in the cold, for example, the skin perfusion in your wrist might be too low for the sensor to work with the Blood Oxygen app to get a measurement.
  • Permanent or temporary changes to your skin, such as some tattoos, can also impact performance. The ink, pattern, and saturation of some tattoos can block light from the sensor, making it difficult for the Blood Oxygen app to get a measurement.
  • Motion is another factor that can affect your ability to get successful background or on-demand measurements. Certain postures, such as arms hanging by your side or fingers in a fist position will also result in unsuccessful measurements.
  • If your heart rate is too high (above 150 bpm) while at rest, you won't be able to get a successful blood oxygen measurement.

About background measurements

The Blood Oxygen app on your Apple Watch will occasionally measure your blood oxygen levels if background measurements are on. This will usually happen when you are not moving. Depending on how active you are, the number of readings collected each day and the time between these readings will vary. Blood oxygen measurements use a bright red light that shines against your wrist, so it may be more visible in dark environments. If you find the light distracting, you can turn off background measurements.

  1. Open the Settings app on your Apple Watch.
  2. Tap Blood Oxygen, then turn off In Sleep Mode and In Theater Mode.

Blood oxygen measurements only occur during sleep if the Track Sleep with Apple Watch setting is turned on.

How the Blood Oxygen app works

In Apple Watch Series 6, the optical heart sensor has been redesigned to add blood oxygen measurement capabilities. During a blood oxygen measurement, the back crystal shines red and green LEDs and infrared light onto your wrist. Photodiodes then measure the amount of light reflected back.

Advanced algorithms use this data to calculate the color of your blood. The color determines your blood oxygen level — bright red blood has more oxygen, while dark red blood has less.

View your Health information

All blood oxygen measurements, whether on-demand or in the background, are saved in the Health app on your iPhone.

  1. Open the Health app.
  2. Tap the Browse tab, then tap Respiratory > Blood Oxygen.

You can also filter and view measurements taken only while sleeping or in a high-elevation environment.

Things you should know

Apple Blood Oxygen App

  • Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes.
  • The Blood Oxygen app is designed for users who are at least 18 years old.

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