You have diagnosed a patient clinically as having SLE and ordered 6 tests.Out of which 4 test have come positive and 2 are negative.To determine the probability of SLE at this point, you need to know -

• A. Incidence and prevalence of SLE
• B. Relative risk of SLE in this patient
• C. Prior probability of SLE; sensitivity and specificity of each test
• D. Incidence of SLE and predictive value of each test