What does the abbreviation n.p.o. indicate?

The abbreviation n.p.o. stands for "nil per os," which is a Latin phrase translating to "nothing by mouth." This is a common medical instruction used to indicate that a patient should not consume any food or liquid orally. It is often applied in clinical settings prior to surgeries, certain medical tests, or when a patient requires specific treatments that should not be affected by oral intake. Understanding this abbreviation is essential for medication aides, as it directly impacts how and when medications can be administered to patients.

The other options reflect actions or instructions that do not pertain to the specific indication that a patient should refrain from oral intake. Hence, recognizing n.p.o. as meaning "nothing by mouth" is crucial for ensuring patient safety and adhering to proper medication administration protocols.