Cold fingers or toes can also cause false readings. Finger tattoos or henna dye can also affect the reading: in this case, choose a different finger, toe, or earlobe. If you're wearing colored nail polish, this might affect the reading. Shaking or shivering will affect the reading, and may make it seem much lower than it actually is. If the probe is too loose or too tight, it may allow extra light in, which will impact the reading. Make sure it is well-fitted, and not being forced on: for example, try the second toe rather than the big toe. Depending on the device, this will usually be on the finger, toe, or earlobe. To get the most accurate reading on a pulse oximeter, there are a few simple steps, according to the World Health Organization: The oximeter numbers are only estimates of your blood oxygen levels - and they should be taken in context. Inability to do an activity that you did before without getting out of breathįor everyday health, you shouldn't rely on pulse oximeter readings alone, says William Berry, Research Scientist at Harvard T.H.Feeling shortness of breath or gasping for air.Other warning signs of low blood oxygen levels may include: In fact, Rizzo says that oxygen saturation by itself is often not the best indicator of medical conditions, and other symptoms are just as important to tell your doctor. That's because the coronavirus can cause a decrease in blood oxygen levels - though if this occurs, it's likely that you'll recognize other symptoms before needing to use a pulse oximeter. Pulse oximeters have also been used to indicate severe cases of COVID-19. Heart failure - may be prescribed home oxygen therapy by their doctor, says Rizzo, and a pulse oximeter can help them to monitor whether the use of oxygen at home is improving their condition or not. Those with lung or heart conditions - such as chronic obstructive pulmonary disease (COPD) or "Unless you have a chronic heart or lung condition that affects your oxygen saturation on a regular basis, most individuals don't need one in their home," says Albert Rizzo, MD, Chief Medical Officer for the American Lung Association. Essentially, this percentage is a calculation of how much oxygen is in the blood, with 100% being 'fully saturated' and the optimal level.Īnd while this simple non-invasive medical tool is available over the counter in many pharmacies, it's not necessary for most people.
A pulse oximeter measures the oxygen saturation of your blood.
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