Margaret A.WinkerMD, Senior EditorIndividualAuthorPhil B.FontanarosaMD, Senior EditorIndividualAuthor
To the Editor.—As one of the authors for JAMA's original series on office laboratory testing,1 I was interested to read THE JOURNAL's 2 recent articles about PT in office testing sites.2,3 I must admit, however, that I come to very different conclusions than these studies' authors. Stull et al2 report that hospital laboratories were successful 97% of the time in 1994 PT, while all other sites were successful 91% of the time. This 91% rate is remarkable given that for most of these other laboratories, 1994 was their first year of PT. We should remember that when PT was "born" in Philadelphia in 1946, half of all of the participating hospital laboratories failed the first PT challenge.
Fischer PM. Accuracy of Physicians' Office Laboratory Results. JAMA. 1998;280(2):129-132. doi:10-1001/pubs.JAMA-ISSN-0098-7484-280-2-jac80010