What is the main purpose of a pulse oximeter?

The main purpose of a pulse oximeter is to measure the oxygen saturation level in the blood. This device works by utilizing light absorption characteristics of oxygenated and deoxygenated hemoglobin to assess how much oxygen is carried in the blood. It gives a rapid, non-invasive measurement that is crucial for monitoring a patient's respiratory status, especially in emergencies or during procedures that may affect breathing.

Oxygen saturation levels help assess how well oxygen is being delivered to the patient’s tissues, playing a vital role in the management of respiratory and cardiac conditions. With accurate readings, healthcare providers can make informed decisions about oxygen therapy and other interventions to ensure adequate oxygenation.

The other options are related to different aspects of patient monitoring but do not align with the specific function of a pulse oximeter. Checking blood pressure is done through a sphygmomanometer, detecting heart rate might involve a stethoscope or heart rate monitor, and recording baseline vital signs encompasses a broader assessment that includes temperature, pulse, respiration rates, and blood pressure but does not specifically focus on oxygen saturation.