c/o stands for which term?

• A. Left
• B. Calcium ion
• C. APAP
• D. Complains of

Answer: (D)

The function tested here is recognizing common medical shorthand used in patient history notes. “c/o” stands for “complains of,” a phrase used to record symptoms that the patient reports verbally. It signals that what follows is subjective information from the patient, not an objective finding you observed yourself. For example, c/o chest pain means the patient reports chest pain. This is commonly used in the history portion of a chart or EMS report to distinguish what the patient describes from what the clinician observes on examination. The other options don’t fit: left is typically abbreviated differently (e.g., Lt or Left), calcium ion would be Ca2+ or Ca, and APAP is a common abbreviation for acetaminophen.