Which term describes the measurement of oxygen levels in the blood?

• A. Blood pressure
• B. Pulse rate
• C. Oximetry
• D. End-tidal CO2

Answer: (C)

The measurement of oxygen levels in the blood is referred to as oximetry. This process typically involves the use of a device known as a pulse oximeter, which is non-invasive and clipped onto a patient's finger, earlobe, or another area with good blood flow. The device uses light sensors to determine the percentage of hemoglobin in the blood that is saturated with oxygen, which is crucial for assessing the respiratory function and ensuring that sufficient oxygen is being delivered to the body's tissues.

Blood pressure measures the force of blood against the walls of the arteries and provides information about cardiovascular health, but it does not indicate oxygen levels. Pulse rate reflects how many times the heart beats per minute, indicating heart rhythm but not directly related to oxygen saturation. End-tidal CO2 measurement assesses the concentration of carbon dioxide in exhaled air, which can provide information about ventilation efficiency but does not measure oxygen levels directly. Hence, oximetry is the most appropriate term for measuring oxygen saturation in the blood.