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Correspondence
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Volume 347:446-448 August 8, 2002 Number 6
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Celiac Sprue

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 by Farrell, R. J.
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To the Editor: In the review of celiac sprue by Farrell and Kelly (Jan. 17 issue),1 the suggested diagnostic approach and the information in Table 2 (positive and negative predictive values of diagnostic serologic tests) may be misleading. For antiendomysial antibodies, the positive predictive value of 98 to 100 percent is based on studies of populations in which the prevalence of the disease is about 50 percent2 — that is, there is a high level of diagnostic suspicion. However, the post-test probability (predictive value) for a patient with a positive test for antiendomysial antibodies depends on the pretest probability. The . . . [Full Text of this Article]


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