What does a pulse oximeter measure?

A pulse oximeter specifically measures the oxygen saturation level in the blood, which is crucial for assessing a patient’s respiratory and circulatory efficiency. It operates by using light wavelengths to estimate the percentage of oxygen-bound hemoglobin in the blood compared to total hemoglobin. The resulting value is typically expressed as a percentage, indicating how well oxygen is being transported throughout the body.

This measurement is vital for monitoring patients, especially those with conditions that affect breathing or circulation, as it provides immediate insights into their oxygenation status. It enables healthcare providers to make swift decisions regarding patient care, particularly in emergency and critical care settings where oxygen delivery is a key concern. By understanding the percentage of oxygen saturation, clinicians can assess whether a patient requires supplemental oxygen or other interventions to improve oxygenation.