What does a pulse oximeter specifically measure?

• A. Heart rate
• B. Blood pressure
• C. Body temperature
• D. Oxygen saturation in the blood

Answer: (D)

A pulse oximeter specifically measures the oxygen saturation in the blood. This device uses light absorption characteristics of oxygenated and deoxygenated hemoglobin to determine the percentage of hemoglobin that is saturated with oxygen. A healthy individual typically has an oxygen saturation level between 95% and 100%.

By providing real-time measurements of oxygen levels, a pulse oximeter is a critical tool in both clinical and home settings, particularly for individuals with respiratory issues. It helps healthcare providers assess how well oxygen is being delivered to the parts of the body, ensuring that any deficiencies in oxygenation can be quickly addressed.

The other options refer to different physiological measurements: heart rate is assessed through pulse palpation or electrocardiogram; blood pressure is taken using a sphygmomanometer; and body temperature is typically measured using a thermometer. Each of these measurements serves a different purpose in monitoring a person's health status, but they do not involve the assessment of oxygen saturation, which is the primary function of a pulse oximeter.