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Joined: May 16, 2012
Comments posted: 1
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As a medical transcriptionist and medical editor, the AAMT Book of Style is my reference, and it states: Use 's to form the plural of lowercase abbreviations, but no apostrophe following all-capital abbreviations.

rbc's not rbcs or RBC's

Use 's to form the plural of single letters and symbols, i.e., serial 7's.

For numbers, add s without an apostrophe. Exception: With single numerals, add 's:

She is in her 20s.
6's and 7's

p.smith May 16, 2012, 7:00pm

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