In patient age notation, what does the abbreviation yo represent?

• A. Year old
• B. Years old
• C. Youth onset
• D. Year of birth

Answer: (A)

In patient age notation, the abbreviation yo after a number means the patient’s age in years. It is read as “XX-year-old,” and you’ll often see it written as a number followed by yo, such as 65 yo, to indicate a 65-year-old patient. This shorthand is a compact way to convey age without writing out “years old.” The other concepts listed aren’t used to denote age in this context—youth onset and year of birth refer to different ideas and aren’t what the abbreviation represents.