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May 16, 2012
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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'sWBCsEEGs
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:
500sShe is in her 20s.6's and 7's
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