What does "PO" stand for?

The abbreviation "PO" stands for "by mouth." This term is commonly used in medical contexts to indicate that medication or food should be taken orally, meaning it is ingested through the mouth. This designation is critical for caregivers and healthcare professionals as it helps them understand the method of administration for medications or nutrition, ensuring that patients receive their treatments in the manner that is intended and safe.

The other options, although related to medical care and terminology, do not accurately reflect the meaning of "PO." For instance, "post-operative" refers to the period after surgery, while "physician ordered" indicates a directive from a doctor. "Physical observation" pertains to monitoring a patient's physical state but does not relate to the method of administration indicated by "PO."