What does the abbreviation "U" mean in medical terminology

Answer #1

It’s just a u, nothing else?

Answer #2

Depends on the context

The greek letter Mu µ is often used to indicate micro or 10^-6. Due to the difficulty of printing the letter µ often a lower case u is often substituted. While mg is milligram ug µg or would indicate microgram.

U can mean unit as in units of insulin.

U can part of an Latin abbreviation such as U. D. for “ut dictum” or “as directed.

That is all I can think of off the top of my head anyway. There may be other things U stands for in medicine.

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