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What Does I&O Mean in Medical Terms?
I&O stands for intake and output. Measurement of fluids taken in and passed out.
intake and output
Measurement of fluids taken in and passed out.
Where you will see I&O
You will most often see I&O in nursing notes, care plans and handovers, kidney unit and dialysis charts.
Example
A chart note might use “I&O” as shorthand for intake and output when documenting a patient's care.
Related abbreviations
- 1,25-(OH)2 vitamin D — 1,25-dihydroxyvitamin D
- 1:1 — one-to-one observation
- 2g Na diet — two-gram sodium diet
- 4-point restraints — four-point restraints
- A&O — alert and oriented
- A&O x4 — alert and oriented times four (person place time situation)
- A-line — A-line (arterial line shorthand)
- a.c. — ante cibum (before meals)
Browse the full Medical Abbreviations guide — 5,715 entries, searchable A–Z and by specialty.
Educational reference only. This guide is for learning and quick reference. Abbreviations vary between hospitals, countries and specialties, and some are discouraged because they can be misread. Always write and interpret orders using your own institution’s approved abbreviation list, and check anything unclear with the prescriber or your local policy.