SPM – MCQ 27 – Predictive value of a test

You have diagnosed a Patient clinically as having SLE and ordered 6 tests out of which 4 tests have come positive and 2 are negative. To determine the probability of SLE at this point, you need to know
A. Prior probability of SLE, sensitivity and specificity of each test
B. Incidence of SLE and the predictive value of each test
C. Incidence and prevalence of SLE
D. Relative risk of SLE in the patient

Answer: A. Prior probability of SLE, sensitivity and specificity of each test