Pulse Oximeter Reads 88%: What to Do First

Health Assessment & Documentation · Question from the ATI PN Fundamentals 2023 Proctored Exam study set

Correct answer: Reposition the sensor probe

Why this is the answer

A low or inaccurate SpO2 reading can result from poor sensor placement or perfusion; repositioning the probe (and checking for interfering factors such as nail polish or motion) is the first troubleshooting step before assuming true hypoxemia.

The bigger concept

Always check the equipment and the client before acting on a number. Cold fingers, nail polish, motion, ambient light, and a loose probe all produce false-low readings. Reposition the sensor while looking at the client — if they are talking comfortably, pink, and not short of breath, the reading is likely artifact; if they are dusky, tachypneic, or anxious, treat it as real, apply oxygen per protocol, and call the RN immediately.

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