Understanding how oxygen moves through the body is key to monitoring respiratory and cardiovascular health. One of the most common tools used by healthcare professionals to gauge this is the pulse oximeter—a small, clip-on device typically attached to the fingertip. It measures the saturation of oxygen in the blood, providing a quick and noninvasive indicator of a person’s respiratory status.
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When oxygen enters the lungs, it binds with hemoglobin, a protein found in red blood cells. Each hemoglobin molecule can carry up to four oxygen molecules and delivers them through arteries and capillaries to the body’s cells, which use the oxygen to produce energy. The now oxygen-depleted hemoglobin then picks up carbon dioxide, a waste product, and carries it back to the lungs for exhalation. The pulse oximeter measures how much of the hemoglobin in the bloodstream is carrying oxygen at a given time—a value known as oxygen saturation.
To perform this measurement, the pulse oximeter emits light through the fingertip and detects how much light is absorbed by the hemoglobin in the blood. It uses two wavelengths of light to distinguish between oxygen-rich and oxygen-poor hemoglobin. The percentage displayed by the device represents how saturated the blood is with oxygen, with typical readings for healthy individuals ranging from 95% to 100%. Levels below 90% indicate hypoxia, a potentially life-threatening condition that requires urgent medical attention.
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Although widely used in both clinical and home settings, pulse oximeter readings can be affected by several external factors. These include skin pigmentation due to melanin, which can influence how light is absorbed, as well as the use of certain nail polishes or artificial nails—especially darker colors like green or blue—that can interfere with the device’s ability to transmit and detect light. The Food and Drug Administration is currently working on draft guidance aimed at improving the accuracy of these devices across different skin tones.
Article by multiple RFHC contributors, based upon information from the National Institute of Standards and Technology (NIST)
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