What Does YO Mean in Medical Terms?

YO stands for years old. Age of a patient in years.

Where you will see YO

You will most often see YO in medical charts and clinical notes, children’s health records.

Example

A chart note might use “YO” as shorthand for years old when documenting a patient's care.

Related abbreviations

• 1-3-6 — EHDI 1-3-6 benchmarks (screen diagnose intervene)
• 17-OHP — 17-hydroxyprogesterone
• 21-hydroxylase — 21-hydroxylase deficiency (CAH)
• 3 Cs measles — three Cs of measles (cough coryza conjunctivitis)
• 90-90 traction — ninety-ninety traction (femur)
• A&O x4 — alert and oriented times four (person place time situation)
• a.m. — ante meridiem (morning)
• A/P — assessment and plan

Browse the full Medical Abbreviations guide — 5,715 entries, searchable A–Z and by specialty.