Final answer:
A pulse oximeter reading of 90 indicates hypoxemia. The nursing assistant should ask the patient to take deep breaths and document the value.
Explanation:
A pulse oximeter reading of 90 indicates hypoxemia, which is a lower-than-normal level of oxygen in the blood. In this case, the nursing assistant should ask the patient to take a few deep breaths to see if the oxygen saturation improves before taking further action. Documenting the value is important for the patient's medical record and monitoring.
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