For the Right Patients, Pulse Oximeters Can Deliver a Sigh of Relief
Posted August 26, 2025
Even without a medical degree, having certain medical equipment in the home can be a helpful way to keep an eye on your or a loved one’s health. For instance, most people are familiar with using a thermometer to determine if you are experiencing a fever. People who have or suspect they are experiencing a respiratory issue or illness may fine an at home oxygen meter just as helpful—and easy to use—as a trusty thermometer.
At home oxygen meters, more commonly known as pulse oximeters are small portable devices that can be placed on your fingertip to measure and monitor your pulse rate (heart rate) and the percentage of oxygen in your blood. They show digital readings for both in a matter of seconds once clipped on your finger.
How do pulse oximeters work?
Pulse oximetry uses infrared light technology that measures the amount of oxygen being carried by your red blood cells. Oxygen reading will show up as SpO2%. A pulse rate will show up as beats per minute (bpm). A normal oxygen reading can range anywhere from SpO2 90–100 percent. A normal, resting pulse rate can range anywhere from 60–100bpm. It is important to note that any of the following conditions can cause a false pulse oximeter reading: nail polish, movement, poor circulation and cold hands.
Are pulse oximeters invasive or do they hurt to use?
Pulse oximeters are not invasive, meaning measurements are taken without drawing blood. Pulse oximeters are typically very small, easy to carry and many fit easily in a small pocket or purse. There are many different models available for purchase online as well as at traditional, brick-and-mortar retailers. Depending of the features included with each model, their cost usually ranges from $20–$50. Some models are able to connect to a smartphone application for easy recording and data storage—a feature that can be helpful to share with your healthcare team.
Who should consider using a pulse oximeter?
Pulse oximeters are most useful for people who have lung and heart problems which can cause abnormally low oxygen levels. Examples of relevant heart and lung problems include Chronic Obstructive Pulmonary Disease (COPD), asthma, heart failure, pneumonia, respiratory failure (wearing home oxygen) and anemia. Regular measurements can detect changes or decline in cardiopulmonary function, which could indicate the need for more advanced care or hospitalization. Like how a thermometer can tell us to get medical attention before a fever gets too high, pulse oximeters can tell us to get help before oxygen or heartbeat levels get too low.
It is important to note that while at-home pulse oximeters are typically accurate, they are still estimates. For more accurate readings you should consult with your provider to see if a blood test should be performed. You should follow your provider’s recommendations about when and how often to check oxygen levels as well as when to notify them of abnormalities.
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