This video describes the factors that affect the Accuracy of Pulse Oximeter Readings. It gives tips for taking Accurate Pulse Oximeter Readings at Home.
----- What is a Pulse Oximeter? -----
A pulse oximeter is a small, clip-like medical device. It attaches to a body part, most commonly to a finger. A pulse oximeter uses a non-invasive method for monitoring a person's blood oxygen saturation (as opposed to measuring oxygen saturation directly through a blood sample). It can rapidly detect even small changes in oxygen levels.
------ Factors Affecting Pulse Oximeter Accuracy --------
- Incorrect Positioning of the Finger
The finger should fit comfortably. It should not be too tight as it may restrict blood circulation. On the other hand, it should not be too loose for the device to fall off or allow outside light to interfere with the reading.
- Nail polish on fingernails or Long dirty fingernails
Nail polish or dirty nails can absorb the light emitted by the pulse oximeter and affect the accuracy of the test.
- Movement of hand while taking the reading
Movement of hand or shivering can result in an inaccurate reading.
- Cold hands and Poor Blood Circulation
Cold hands and fingers mean that the blood flow and circulation to your hand is low and may cause difficulty for the oximeter to detect a good pulse signal.
- Current Tobacco Use
A person who smokes heavily might cause their oxygen saturation to be measured at 8% higher.
- Skin Thickness and Skin Pigmentation
It has been found that dark skin or high pigmentation skin can result in overestimation of oxygen saturation, especially at low saturation levels.
Using under a Direct Bright Light Source
- Direct bright light in the room or bright sunlight can interfere and result in an inaccurate reading
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