RICHARD LOFGREN, M.D.; TERRY W. CROWSON, M.D.
To the editor: The technologic advances of the past several decades have presented practicing physicians with many diagnostic tests and procedures. The effective use of this technology is a major challenge for clinicians, and efforts to make physicians more aware of the principles of effective use (1) may be hindered by confusing terminology. Such is the case with the term predictive value.
In the medical literature, positive predictive value is commonly reported by the following formula:
As discussed by Griner and his colleagues (1), this formula is applicable only in situations in which prevalence or prior probability of disease is
LOFGREN R, CROWSON TW. Diagnostic Tests and Procedures. Ann Intern Med. ;95:387–389. doi: 10.7326/0003-4819-95-3-387_2
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Published: Ann Intern Med. 1981;95(3):387-389.
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