Measuring the oxygen level of the blood using a noninvasive, clip-like device on either the earlobe or fingertip is

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Measuring the oxygen saturation of the blood using a noninvasive, clip-like device on either the earlobe or fingertip is pulse oximetry. This method is commonly used in healthcare settings to monitor patients' oxygen levels during procedures, treatments, or in cases of respiratory distress. A pulmonary function test (A) is a different type of test that assesses lung function, while PEEP (C) and spirometry (D) are specific interventions or techniques used for respiratory support or evaluation.

Measuring the Oxygen Level of the Blood Using a Noninvasive