- For infants and children, the normal oxygen saturation level should range between 97% to 99%. For neonates and young infants, the normal oxygen saturation level should range between 93% to 100%. For adults less than 70 years of age, the normal oxygen saturation level should range between 96% to 98%.
- In practice, the SpO2 range of 92–100% is generally acceptable for most clients. Some experts have suggested that a SpO2 level of at least 90% will prevent hypoxic tissue injury and ensure client safety (Beasley, et al., 2016).
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Background: Compared to measurements at sea level, measurement of oxygen saturation by pulse oximetry (SpO 2) at altitude differs fundamentally because of the cyclical course of SpO 2, caused by periodic breathing.Therefore, the determination of a representative SpO 2 value is difficult. In the literature, recommendations for a standardized measurement procedure are missing; different studies. Normal SpO2 values vary between 90 and 100%. Good blood oxygenation is necessary to supply the energy your muscles need in order to function, which increases during a sports activity. If your SpO2 value is below 90%, that could be a sign of poor blood oxygenation, also called hypoxia.
What is SpO2?
SpO2, also known as oxygen saturation, is a measure of the amount of oxygen-carrying hemoglobin in the blood relative to the amount of hemoglobin not carrying oxygen. The body needs there to be a certain level of oxygen in the blood or it will not function as efficiently. In fact, very low levels of SpO2 can result in very serious symptoms. This condition is known as hypoxemia. There is a visible effect on the skin, known as cyanosis due to the blue (cyan) tint it takes on. Hypoxemia (low levels of oxygen in the blood) can turn into hypoxia (low levels of oxygen in the tissue). This progression and the difference between the two conditions is important to understand.
How the Body Maintains Normal SpO2 levels
It is vital to maintain normal oxygen saturation levels in order to prevent hypoxia. Thankfully, the body usually does this by itself. The most important way that the body maintains healthy SpO2 levels is through breathing. The lungs take oxygen that has been inhaled and binds it to hemoglobin that then travels throughout the body with the payload of oxygen. The oxygen needs of the body increase during times of high physiological stress (e.g., lifting weights or running) and at higher altitudes. The body is usually able to adapt to these increases, provided that they are not too extreme.
Measuring SpO2
There are many ways that the blood can be tested to ensure it contains normal oxygen levels. The most common way is to use a pulse oximeter to measure the SpO2 levels in the blood. Pulse oximeters are relatively easy to use, and are common in health care facilities and at home. They are very accurate despite their low price point.
To use a pulse oximeter, simply place it on your finger. A percentage will be displayed on the screen. This percentage should be between 94 percent and 100 percent, which indicates a healthy level of hemoglobin carrying oxygen through the blood. If it is less than 90 percent, you should see a doctor.
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How Pulse Oximeters Measure Oxygen in the Blood
Pulse oximeters have been in use for many years. However, they were mostly used by health care facilities until recently. Now that they have become relatively common in the home, many people are wondering how they work.
Pulse oximeters function by using light sensors to record how much blood is carrying oxygen and how much blood is not. Oxygen-saturated hemoglobin appears to be a brighter red to the naked eye than non-oxygen saturated hemoglobin, and this phenomenon allows the highly sensitive sensors of the pulse oximeter to detect minute variations in the blood and translate that into a reading.
Symptoms of Hypoxemia
There are several common symptoms of hypoxemia. The number and severity of these symptoms depend on how low the SpO2 levels are. Moderate hypoxemia results in fatigue, light-headedness, numbness and tingling of the extremities and nausea. Beyond this point, hypoxemia usually becomes hypoxia.
Symptoms of Hypoxia
A normal SpO2 level is vital to maintaining the health of all tissue in the body. As previously mentioned, hypoxemia is low oxygen saturation in the blood. Hypoxemia is directly related to hypoxia, which is low oxygen saturation in the body’s tissue. Hypoxemia often causes hypoxia, if the oxygen levels are quite low, and remain so. Cyanosis is a good indicator of hypoxemia becoming hypoxia. However, it is not perfectly reliable. For example, someone with a darker complexion will not present with obvious cyanosis. Cyanosis also often fails to increase in visibility as the hypoxia becomes more severe. Other symptoms of hypoxia, however, do become more severe. Severe hypoxia causes twitches, disorientation, hallucinations, pallor, irregular heartbeat and eventually death. Hypoxia often has a snowball effect, in that once the process is started, it speeds up and the condition rapidly becomes more severe. A good rule of thumb is to get help as soon as your skin starts taking on a blue tinge.
Editor's Note: This article was updated Feb. 8, 2021 to reflect new information.
The normal oxygen saturation level is 97–100% (OER #1).
Older adults typically have lower oxygen saturation levels than younger adults. For example, someone older than 70 years of age may have an oxygen saturation level of about 95%, which is an acceptable level.
It is important to note that the oxygen saturation level varies considerably based on a person’s state of health. Thus, it is important to understand both baseline readings and underlying physiology associated with certain conditions to interpret oxygen saturation levels and changes in these levels.
Normal Spo2 Level Sleeping
- People who are obese and/or have conditions such as lung and cardiovascular diseases, emphysema, chronic obstructive pulmonary disease, congenital heart disease and sleep apnea tend to have lower oxygen saturation levels.
- Smoking can influence the accuracy of pulse oximetry in which the the SpO2 is low or falsely high depending on whether hypercapnia is present. With hypercapnia, it is difficult for the pulse oximeter to differentiate oxygen in the blood from carbon monoxide (caused by smoking).
- Oxygen saturation levels may decrease slightly when a person is talking.
- Oxygen saturation may remain normal (e.g., 97% and higher) for people with anemia. However, this may not indicate adequate oxygenation because there are less hemoglobin to carry an adequate supply of oxygen for people who have anemia. The inadequate supply of oxygen may be more prominent during activity for people with anemia.
- Falsely low oxygen saturation levels may be associated with hypothermia, decreased peripheral perfusion, and cold extremities. In these cases, an ear lobe pulse oximeter device or arterial blood gases would provide a more accurate oxygen saturation level. However, arterial blood gases are usually only taken in critical care or emergency settings.
Normal Spo2 Levels Chart
Points to Consider
Normal Spo2 Levels By Age
In practice, the SpO2 range of 92–100% is generally acceptable for most clients. Some experts have suggested that a SpO2 level of at least 90% will prevent hypoxic tissue injury and ensure client safety (Beasley, et al., 2016).
Normal Spo2 Level By Age
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Part of this content was adapted from OER #1 (as noted in brackets above):
© 2015 British Columbia Institute of Technology (BCIT). Clinical Procedures for Safer Patient Care by Glynda Rees Doyle and Jodie Anita McCutcheon, British Columbia Institute of Technology. Licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted. Download this book for free at http://open.bccampus.ca