Abbreviations: Degrees and Certifications

In general, use periods in academic degrees:
Ph.D.
M.D.
R.N.
B.A.
The exception is MBA. Most reference books, including the dictionary, leave the periods out of that one, so we will, too.

In general, do not use periods in professional certifications (updated 1/26/22):
CDCES (formerly CDE; updated 7/31/20)
CKD
RD

Sometimes this will result in mixed formats in a single byline:
Jane Johnson, Ph.D., CDE


 

Abbreviations
Capitalization
Company Names
Dates and Times
Degrees and Certifications
Periods
Plurals
Spaces

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