Intended for healthcare professionals

Letters TYM and Alzheimer’s disease

Too many false positives

BMJ 2009; 339 doi: (Published 15 July 2009) Cite this as: BMJ 2009;339:b2828
  1. Stephen L Black, retired (emeritus) professor of psychology1
  1. 1Bishop’s University, Sherbrooke, Quebec, Canada J1M 1Z
  1. sblack{at}

    Brown and colleagues report 93% sensitivity and 86% specificity for their self administered screening test for Alzheimer’s disease.1 They conclude that “it is a powerful and valid screening test for the detection of Alzheimer’s disease.”

    However, doctors and lay people are often confused by …

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