A patient has poor extremity circulation affecting pulse oximetry readings. What is the most appropriate action?

Using a pulse oximeter on a different anatomical site, such as the patient's ear, is appropriate in situations where peripheral circulation is compromised. Poor extremity circulation can lead to inaccurate readings from finger probes, as the blood flow may not be sufficient to obtain a reliable measurement.

The ear is a good alternative site because it has a rich blood supply and usually provides a more stable reading when peripheral circulation is poor. The anatomy of the ear allows for effective transmission of the light used in pulse oximetry, which is crucial for the accurate assessment of oxygen saturation levels.

Utilizing different anatomical sites for pulse oximetry can help in obtaining reliable data, particularly in clinical settings where rapid assessment is necessary. This also helps ensure that the patient receives appropriate monitoring and care based on accurate oxygen saturation readings.