title: A testing question.
authors: Oxford Applied Epidemiology Network.
authors: H
authors: H
authors: Buchan
authors: M
authors: M
authors: Gray
authors: A
authors: A
authors: Hill
authors: A
authors: A
authors: Coulter
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D003955:Diagnostic Tests, Routine / Q000592:standards*; D004739:England; D006801:Humans; D008403:Mass Screening / Q000592:standards*; D010043:Outcome and Process Assessment, Health Care; D011237:Predictive Value of Tests