Sig code: frequency
Q3H medical abbreviation
Q3H means "every 3 hours".
Each meaning matched at least two public references (3 in all for Q3H), checked October 23, 2026. The table lists them.
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What Q3H means
| Meaning | Latin origin | Where used | Checked against |
|---|---|---|---|
| every 3 hours | None | Prescriptions, Medication labels |
Also written: q3h.
Example
Sample nursing order text: "check Q3H."
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 Q3H mean in medical terms?
Q3H means "every 3 hours".
Where is Q3H used?
Q3H shows up in prescriptions and medication labels. Its category here is sig code: frequency.
Is Q3H on the Joint Commission Do Not Use list?
No. Q3H is not on the Joint Commission Do Not Use list or the ISMP error-prone list as checked on October 23, 2026.