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 negative. To determine the probability of SLE at this point, you need to know-
Prior Probability of SLE; sensibility and specificity of each test Incidence of SLE predictive value of each test Incidence and prevalence of SLE Relative risk of SLE in this patient