How does a pulse oximeter assist in respiratory assessment?

A pulse oximeter is a medical device specifically designed to measure the oxygen saturation levels in the blood, which is crucial for evaluating respiratory function. It works by using light absorption through a relatively thin part of the body, usually a fingertip or earlobe, to estimate the percentage of hemoglobin that is saturated with oxygen. By providing real-time data on oxygen saturation, the pulse oximeter allows healthcare professionals to assess how effectively oxygen is being transported throughout the body. This is particularly important in patients with respiratory conditions, as low oxygen saturation may indicate inadequate ventilation or gas exchange.

The other options reference assessments that are not performed by a pulse oximeter, such as blood pressure measurements which are related to heart function, respiratory rate evaluation which involves monitoring breathing patterns separately, and measuring carbon dioxide levels which typically requires different devices such as capnometers or arterial blood gas analysis. Thus, the pulse oximeter plays a distinct and essential role in respiratory assessment by specifically focusing on oxygen saturation levels.