What does "C/O" commonly stand for in medical notes?

In medical notes, "C/O" stands for "complains of." This abbreviation is commonly used by healthcare professionals to succinctly document the symptoms or issues that a patient reports experiencing during their visit. For example, if a patient mentions they have chest pain, the medical scribe would note this as "C/O chest pain" in the documentation. This shorthand is widely recognized in clinical settings and helps streamline communication among healthcare providers, ensuring that important patient information is conveyed clearly and efficiently.

The other options do not accurately reflect the standard use of "C/O" in medical terminology. "Coordinates of origin," "Change of oxygen," and "Condition observed" do not commonly appear in the context of patient complaints or medical documentation, making "complains of" the correct interpretation.