Licensing diagnostic tests may benefit everyone

doi:10.1136/bmj.330.7503.1330

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Eric S Kilpatrick, consultant in chemical pathology (Eric.Kilpatrick@hey.nhs.uk)

Hull Royal Infirmary, Hull HU3 2JZ

EDITOR—Gluud and Gluud compare the introduction of new diagnostic tests with that of a new drug.1 However, laboratory diagnostic tests need only to prove that they are able to measure a given analyte, not that the measurement is of any use in managing patients. An inappropriately used test may have “side effects” leading to a delay in diagnosis or further …