Table 2. Sources of Pathologist Workforce Numbers.

Source	Pathologists, No.	Date of data collection	Data source	Comment
AMA, 2019	21 292	June 2019	AMA	Data private
AMA Physician Masterfile, commercially available 2018	19 222	October 2018	AMA licensee	Masterfile available through database licensee
AAMC report11 and Metter et al,1 2019	12 839	2017	AAMC and AMA	Released biennially. omits all pathologists with specialty boards
Fraher et al12	Approximately 17 700	June 2013	Unclear	Likely from AMA commercial datafile. assumes an approximately 2% growth per year
Robboy et al,2 2013 and Robboy et al,13 2015	17 986	December 2010	Multiple	Based on AMA commercially available Masterfile emended after state medical boards comparative review

Abbreviations: AAMC, Association of American Medical Colleges; AMA, American Medical Association.