<prompt> You have clinically diagnosed a patient as having SLE and ordered 6 tests, out of which 4 have come positive and 2 have negative. To know the probability of SLE at this point, you need to know:Incidence of SLE and predictive value of each testIncidence and prevalence of SLERelative risk of SLE in this patientPrior probability of each test, sensitivity and specificity of each test  <response>: To know the probability of SLE at this point,We need to know Prior probability Prevalence of each test, sensitivity and specificity of each test Probability of having a Disease means PPV i.e. Positive Predictive Value and it depends upon BAYESTHEORM sensitivity specificity and disease Prevalence 