Buy Oximeters online and view local Walgreens inventory. Free shipping at $35. Find Oximeters coupons, promotions and product reviews on Walgreens.com. Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood.The human body requires and regulates a very precise and specific balance of oxygen in the blood. Normal arterial blood oxygen saturation levels in humans are 95–100 percent. If the level is below 90 percent, it is considered low and called hypoxemia.

Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood. The human body requires and regulates a very precise and specific balance of oxygen in the blood. Normal arterial blood oxygen saturation levels in humans are 95–100 percent. If the level is below 90 percent, it is considered low and called hypoxemia.^[1] Arterial blood oxygen levels below 80 percent may compromise organ function, such as the brain and heart, and should be promptly addressed. Continued low oxygen levels may lead to respiratory or cardiac arrest. Oxygen therapy may be used to assist in raising blood oxygen levels. Oxygenation occurs when oxygen molecules (O
₂) enter the tissues of the body. For example, blood is oxygenated in the lungs, where oxygen molecules travel from the air and into the blood. Oxygenation is commonly used to refer to medical oxygen saturation.

Definition[edit]

In medicine, oxygen saturation, commonly referred to as 'sats', measures the percentage of hemoglobin binding sites in the bloodstream occupied by oxygen.^[2] At low partial pressures of oxygen, most hemoglobin is deoxygenated. At around 90% (the value varies according to the clinical context) oxygen saturation increases according to an oxygen-hemoglobin dissociation curve and approaches 100% at partial oxygen pressures of >11 kPa. A pulse oximeter relies on the light absorption characteristics of saturated hemoglobin to give an indication of oxygen saturation.

Physiology[edit]

The body maintains a stable level of oxygen saturation for the most part by chemical processes of aerobic metabolism associated with breathing. Using the respiratory system, red blood cells, specifically the hemoglobin, gather oxygen in the lungs and distribute it to the rest of the body. The needs of the body's blood oxygen may fluctuate such as during exercise when more oxygen is required ^[3] or when living at higher altitudes. A blood cell is said to be 'saturated' when carrying a normal amount of oxygen.^[4] Both too high and too low levels can have adverse effects on the body.^[5]

Measurement[edit]

An SaO₂ (arterial oxygen saturation, as determined by an arterial blood gas test^[6]) value below 90% indicates hypoxemia (which can also be caused by anemia). Hypoxemia due to low SaO₂ is indicated by cyanosis. Oxygen saturation can be measured in different tissues:^[6]

• Venous oxygen saturation (SvO₂) is the percentage of oxygenated hemoglobin returning to the right side of the heart. It can be measured to see if oxygen delivery meets the tissues' demands. SvO₂ typically varies between 60% and 80%.^[7] A lower value indicates that the body is in lack of oxygen, and ischemic diseases occur. This measurement is often used under treatment with a heart lung machine (extracorporeal circulation), and can give the perfusionist an idea of how much flow the patient needs to stay healthy.
• Tissue oxygen saturation (StO₂) can be measured by near infrared spectroscopy. Although the measurements are still widely discussed, they give an idea of tissue oxygenation in various conditions.
• Peripheral oxygen saturation (SpO₂) is an estimation of the oxygen saturation level usually measured with a pulse oximeter device. It can be calculated with pulse oximetry according to the formula^[6] where HbO₂ is oxygenated hemoglobin (oxyhemoglobin) and Hb is deoxygenated hemoglobin.

Pulse oximetry[edit]

Pulse oximetry is a method used to estimate the percentage of oxygen bound to hemoglobin in the blood.^[8] This approximation to SaO₂ is designated SpO₂ (peripheral oxygen saturation). The pulse oximeter consists of a small device that clips to the body (typically a finger, an earlobe or an infant's foot) and transfers its readings to a reading meter by wire or wirelessly. The device uses light-emitting diodes of different colours in conjunction with a light-sensitive sensor to measure the absorption of red and infrared light in the extremity. The difference in absorption between oxygenated and deoxygenated hemoglobin makes the calculation possible.^[6]

Medical significance[edit]

Healthy individuals at sea level usually exhibit oxygen saturation values between 96% and 99%, and should be above 94%. At 1,600 meters' altitude (about one mile high) oxygen saturation should be above 92%.^[9]

An SaO₂ (arterial oxygen saturation) value below 90% causes hypoxia (which can also be caused by anemia). Hypoxia due to low SaO₂ is indicated by cyanosis, but oxygen saturation does not directly reflect tissue oxygenation. The affinity of hemoglobin to oxygen may impair or enhance oxygen release at the tissue level. Oxygen is more readily released to the tissues (i.e., hemoglobin has a lower affinity for oxygen) when pH is decreased, body temperature is increased, arterial partial pressure of carbon dioxide (PaCO₂) is increased, and 2,3-DPG levels (a byproduct of glucose metabolism also found in stored blood products) are increased. When the hemoglobin has greater affinity for oxygen, less is available to the tissues. Conditions such as increased pH, decreased temperature, decreased PaCO₂, and decreased 2,3-DPG will increase oxygen binding to the hemoglobin and limit its release to the tissue.^[10]

See also[edit]

References[edit]

1. ^'Hypoxemia (low blood oxygen)'. Mayo Clinic. mayoclinic.com. Retrieved 6 June 2013.
2. ^Kenneth D. McClatchey (2002). Clinical Laboratory Medicine. Philadelphia: Lippincott Williams & Wilkins. p. 370. ISBN9780683307511.
3. ^'Understanding Blood Oxygen Levels at Rest'. fitday.com. fitday.com. Retrieved 6 June 2013.
4. ^Ellison, Bronwyn. 'NORMAL RANGE OF BLOOD OXYGEN LEVEL'. Livestrong.com. Livestrong.com. Retrieved 6 June 2013.
5. ^'Hypoxia and Hypoxemia: Symptoms, Treatment, Causes'. WebMD. Retrieved 2019-03-11.
6. ^ ^abcd'Understanding Pulse Oximetry: SpO2 Concepts'. Philips Medical Systems. Retrieved 19 August 2016.
7. ^https://www.lhsc.on.ca/critical-care-trauma-centre/central-venous/mixed-venous-oxygen-saturation
8. ^Peláez EA, Villegas ER (2007). 'LED power reduction trade-offs for ambulatory pulse oximetry'. Conf Proc IEEE Eng Med Biol Soc. 2007: 2296–9. doi:10.1109/IEMBS.2007.4352784. ISBN978-1-4244-0787-3. PMID18002450. S2CID34626885.
9. ^'Normal oxygen level'. National Jewish Health. MedHelp. February 23, 2009. Retrieved 2014-01-28.
10. ^Schutz (2001). 'Oxygen Saturation Monitoring by Pulse Oximetry'(PDF). American Association of Critical Care Nurses. Archived from the original(PDF) on January 31, 2012. Retrieved September 10, 2011.

External links[edit]

Your Fitbit smartwatch uses sensors to estimate your blood oxygen saturation (SpO2) while you sleep.

The Fitbit SpO2 feature is intended for general wellness purposes only and should not be used or relied on for any medical purposes. Consult your health care professional about any questions or health issues you may have.

Your blood oxygen saturation (SpO2) is the percentage of your blood that’s saturated with, or contains, oxygen. The oxygen levels in your blood tend to remain relatively constant, even during exercise and sleep.

Add SpO2 to your Fitbit device

To collect SpO2 data, install an SpO2 clock face (available on Ionic, Sense, and Versa series) or the SpO2 app (available on Sense and Versa 3).

To install an SpO2 clock face:

1. With your Fitbit device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Clock Faces > All Clocks.
3. Find the SpO2 clock face category. You might have to swipe up to find it. Tap View All to see the complete list of available clock faces.
4. Tap the clock face you want to install > Select > Install.

The SpO2 clock faces are only available in certain countries at this time. If you don’t see them in the Clock Face Gallery, the feature isn’t available in your region. For more information on the availability of Fitbit SpO2, see fitbit.com.

If you have trouble adding an SpO2 clock face to your Fitbit device, make sure you update your watch to run the latest version of Fitbit OS. For instructions, see How do I update my Fitbit device?

To install the SpO2 app (Sense and Versa 3 only):

1. With your Fitbit device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Apps > All Apps.
3. Tap the magnifying glass icon and search for “SpO2 Tracker”.
4. In the results, tap SpO2 Tracker > Install.

Blood Oxygen Monitor Reviews

The SpO2 app doesn’t appear as an app on your watch; instead, it runs in the background to track your SpO2 data. View your results in the Fitbit app.

Note that your watch must be running Fitbit OS 5.1 to install the SpO2 app. For more information on updating your watch, see How do I update my Fitbit device?

The Fitbit SpO2 app is automatically added for users in select countries. For more information on updating your tracker, see How do I update my Fitbit device? For more information on the availability of Fitbit SpO2, see fitbit.com.

If you removed the SpO2 app from your device, reinstall it in the Fitbit app on your phone:

Blood Oxygen Monitor Walgreens

1. With your Fitbit device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Apps > All Apps.
3. In the list of apps, tap SpO2 > Install.

See your most recent SpO2 levels on your device

See your nightly SpO2 data on an SpO2 clock face:

1. Wear your Fitbit device to bed, and sync it in the morning.
2. Check your clock face to see your average SpO2 level and the range of values detected.

It may take around an hour for your SpO2 values to appear on the clock face after you sync your device. The clock face shows data for your most recent sleep session. If your sleep session is split into 2 separate logs or you take a long nap, the clock face updates to show data for the most recent sleep session after your device syncs with the Fitbit app.

1. Wear your Fitbit device to bed. Wear your device securely so that the back of your device is in contact with your skin.
2. In the morning, swipe up from the clock face. See your average resting SpO2 level on the SpO2 tile.

It may take around an hour for your SpO2 values to appear after you wake up. The SpO2 tile shows data for your most recent sleep session. If your sleep session is split into 2 separate logs or you take a long nap, the tile updates to show data for the most recent sleep session.

Track your SpO2 trends in the Fitbit app

See your SpO2 trends in the Health Metrics tile in the Fitbit app on your phone. The Health Metrics tile is available with Fitbit Charge 4, Fitbit Sense, Fitbit Versa 2, and Fitbit Versa 3. To see historical data, upgrade to Fitbit Premium. For other devices, a Fitbit Premium subscription is required to see health metrics data.

1. Wear your device for at least a full day, including to sleep at night.
2. In the morning, open the Fitbit app and tap the Health Metrics tile.
3. Swipe up to find the Oxygen Saturation (SpO2) tile.

Note that for Ionic, Versa, Versa Lite Edition, and Versa 2, SpO2 data is only collected when you use an SpO2 clock face. For a list of compatible SpO2 clock faces, see Add SpO2 to your Fitbit device. For Sense and Versa 3 you can install either an SpO2 clock face or the SpO2 app to collect SpO2 data. Charge 4 users must have the SpO2 app installed.

Your Fitbit device measures your SpO2 levels while you sleep using red and infrared sensors on the back of the device. The sensors shine red and infrared light onto your skin and blood vessels, and use the reflected light that bounces back to estimate how much oxygen is in your blood:

• Richly oxygenated blood reflects more red light than infrared light.
• Poorly oxygenated blood reflects more infrared light than red light.

Note that you might see the red and infrared sensors continue to blink for around 30 minutes after you wake up.

Blood Oxygen Monitor App

SpO2 values naturally vary, and nighttime SpO2 is usually lower than daytime SpO2 due to the fact that your breathing rate is usually slower during sleep. In general, SpO2 values during sleep are typically above 90%. The SpO2 values presented are an estimate and in general can be influenced by your activity, altitude, and overall health.

You may notice an SpO2 value that seems lower than expected. This can be due to:

• Your arm position and movement
• The position and fit of your Fitbit device
• Limited blood flow to the surface of the skin
• Differences in anatomical body structures can also impact the accuracy of your Fitbit device’s sensors.

Several factors can affect your body's ability to maintain blood oxygen levels. These include, but are not limited to, the following:

• There must be enough oxygen in the air you are breathing.
• Your lungs must be able to inhale air containing oxygen and exhale carbon dioxide.
• Your bloodstream must be able to carry oxygen throughout your body.

An issue with any of these factors could impact your SpO2 values. For example, in high altitudes the air is less dense and therefore contains less oxygen. If you experience low SpO2 values while at high altitudes you may want to consider descending to a lower altitude.

Certain health problems can also impact the body's ability to take in oxygen. These factors can be compounded under more extreme circumstances such as during intensive exercise.

You should not use or rely on the SpO2 reading on your Fitbit device for any medical purposes. If you have concerns about your health, you should consult your healthcare provider.

If you see the message “SpO2 not installed” on your clock face, install the SpO2 Tracker app. For instructions, see Add SpO2 to your Fitbit device.

If you see dashed lines on the clock face or SpO2 tile, a message that the SpO2 data couldn’t be read, or missing data in the Health Metrics tile in the Fitbit app on your phone, keep in mind the following:

• Your device doesn’t retroactively measure your SpO2 values. When you start using Fitbit SpO2, you’ll see dashed lines until after your next sleep session.
• You must get at least 3 hours of quality sleep. Data is only collected when you’re still. If you move a lot during your sleep or the sleep session is too short, you might not get SpO2 data.
• Charge your Fitbit device to make sure it’s able to collect data throughout your entire sleep session. Note that you may have to charge your Fitbit device more often when using an SpO2 clock face or app.
• You must sync your Fitbit device with the Fitbit app before the clock shows your SpO2 data. Note that it may take around an hour for your SpO2 values to appear after you sync your device. For troubleshooting syncing, see Why won't my Fitbit device sync?
• Turning off any SpO2 clock face or app permissions can cause the feature to stop functioning. For instructions on adjusting permissions, see How do I install and manage apps on my Fitbit device?
• Your Fitbit device must be able to consistently track your SpO2 data:
  • Wear your device slightly higher on your wrist.
  • Make sure your device is in contact with your skin.
  • Your device should be snug but not constricting.
  • Tattooed skin can impact the accuracy of the red and infrared sensors on your Fitbit device.

You may have to charge your Fitbit device more often when collecting SpO2 data.

To remove SpO2 tracking, change your clock face to one not listed in the SpO2 clock face category:

1. With your device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Clock Faces > All Clocks.
3. Browse the available clock faces. Tap the clock face you want and tap Select to install it.

If you installed the SpO2 app, uninstall it:

1. With your device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Apps > SpO2 Tracker > Remove > Uninstall.

1. With your device nearby, in the Fitbit app, tap the Today tab > your profile picture > your device image.
2. Tap Apps > SpO2 > Remove > Uninstall.

Blood Oxygen Monitor With Recorder

Estimated oxygen variation (EOV) is an estimate of the changes in your blood oxygen saturation levels. For instructions, see How do I track my estimated oxygen variation in the Fitbit app? The EOV feature is designed to see specific events overnight when your blood oxygen saturation levels varied, which could indicate breathing disturbances.

Fitbit SpO2 estimates your average blood oxygen saturation levels and range while you sleep. It’s designed to see potential changes to your fitness and wellness.

Blood Oxygen Monitor Device

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