Micrograms
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Micrograms
Microgram
Unit systemSI
Unit ofmass
Symbol?g 

In the metric system, a microgram or microgramme is a unit of mass equal to one millionth of a gram. The unit symbol is ?g according to the International System of Units; the recommended symbol in the United States when communicating medical information is mcg. In ?g the prefix symbol for micro- is the Greek letter ? (Mu).

Abbreviation and symbol confusion

When the Greek lowercase "?" (Mu) in the symbol ?g is typographically unavailable, it is occasionally--although not properly--replaced by the Latin lowercase "u".

The United States-based Institute for Safe Medication Practices (ISMP) and the U.S. Food and Drug Administration (FDA) recommend that the symbol ?g should not be used when communicating medical information due to the risk that the prefix ? (micro-) might be misread as the prefix m (milli-), resulting in a thousandfold overdose. The non-SI symbol mcg is recommended instead.[1] However, the abbreviation mcg is also the symbol for an obsolete CGS unit of measure known as millicentigram, which is equal to 10 ?g.

In the UK, the ?g symbol is the widely recognized method of identifying micrograms.[2]

Gamma (symbol: ?) is a deprecated non-SI unit of mass equal to one microgram.[3]

The "microgram" symbol is encoded by Unicode at code point SQUARE MU G ? ug ?.[4]

See also

References

  1. ^ "ISMP's List of Error-Prone Abbreviations, Symbols, and Dose Designations". ISMP. Retrieved .
  2. ^ "List of UK NHS Dose Designations". NHS. Retrieved .
  3. ^ NIST Handbook 133 - 2018, Appendix E. General Tables of Units of Measurement, page 159 (17)
  4. ^ Unicode Consortium (2019). "The Unicode Standard 12.0 - CJK Compatibility ? Range: 3300--33FF ?" (PDF). Unicode.org. Retrieved 2019.

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