What is the purpose of a pulse oximeter?

The primary purpose of a pulse oximeter is to non-invasively measure the oxygen saturation of hemoglobin in the blood. This device emits light wavelengths that pass through the skin, typically at the fingertip or earlobe. By analyzing the light absorption characteristics of oxygenated and deoxygenated hemoglobin, the pulse oximeter can provide a percentage value, which reflects how well oxygen is being transported in the bloodstream.

This measurement is crucial in various clinical settings, particularly for patients with respiratory conditions, as it helps in monitoring their oxygen status without the need for invasive blood draws. By observing the oxygen saturation levels, healthcare providers can assess whether a patient requires additional oxygen therapy or if adjustments to their treatment plan are necessary.

While a pulse oximeter may be used in conjunction with heart rate monitoring, its primary function is not to continuously monitor heart rate. Additionally, it does not deliver oxygen therapy or assess lung capacity; those functions involve different devices and techniques, such as spirometers for lung capacity and oxygen delivery systems for administering oxygen. Thus, the correct answer highlights the specific and essential role of the pulse oximeter in oxygen saturation assessment.