Intended for healthcare professionals

Letters Dangerous diagnostics?

Assessing diagnostic tests for more than screening

BMJ 2019; 365 doi: (Published 05 June 2019) Cite this as: BMJ 2019;365:l2273
  1. Huw Llewelyn, general physician and endocrinologist, honorary fellow in mathematics
  1. Aberystwyth University, Aberystwyth SY23 3FL, UK
  1. hul2{at}

Holloway and colleagues draw attention to the regulatory defects of diagnostic test assessment.1 But even if all tests were assessed, this would be only for their performance as screening tests by evaluating their false positive and false negative rates. This is done for …

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