Unit of measure
OZ medical abbreviation
OZ means "ounce".
On the ISMP List of Error-Prone Abbreviations. ISMP suggests: Use the metric system.
Each meaning matched at least two public references (4 in all for OZ), checked October 23, 2026. The table lists them.
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What OZ means
| Meaning | Latin origin | Where used | Checked against |
|---|---|---|---|
| ounce | None | Prescriptions, Charting |
Also written: oz.
Example
Training example of an error-prone entry: "oz" on a label.
A made-up line that shows the abbreviation in place. It is not about any patient and is not an instruction.
Related abbreviations
Elsewhere on Rivvi
Questions
What does OZ mean in medical terms?
OZ means "ounce".
Where is OZ used?
OZ shows up in prescriptions and charting. Its category here is unit of measure.
Is OZ on the Joint Commission Do Not Use list?
No, but ISMP lists OZ as an error-prone abbreviation. ISMP's suggested practice: Use the metric system.