In addition to the finger, what is an alternate location for performing pulse oximetry?

• A. Toe
• B. Earlobe
• C. Nose
• D. Palm

Answer: (A)

Pulse oximetry measures oxygen saturation by detecting pulsatile arterial blood through a light sensor. When the finger isn’t suitable, you can place the sensor on other well-perfused sites, such as the toe. The toe is a common alternative because it has good blood flow, is easy to access when the hands can’t be used, and generally provides reliable readings for monitoring. Other sites like the earlobe or nose can be used in certain situations, but readings may be more affected by temperature, perfusion, or movement, which can make them less practical in everyday use.