What it means
A microgram is one millionth of a gram, or one thousandth of a milligram. The Greek letter µ (mu) is easily misread, especially in handwriting, as "m," turning micrograms into milligrams, a thousandfold overdose. ISMP lists µg as error-prone and advises writing mcgMY-kroh-gram (said in full)Microgram: one millionth of a gram, or one thousandth of a milligram.Full entry .
For the nurse
Write "mcg." Clarify any order written with µg before giving the drug.
At a glance
| Also written | μg |
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