To determine the probabilit y of 'SLE at this point,you need to know

You have diagnosed apatient clinically as having SLE and ordered 6 tests, out of which 4 test have positive and 2 are negative.To determine the probabilit y 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 predictive value of each test
c.incidence and prevalence of SLE
d.Relative risk of SLE in this patient

ans:a.Prior probability of SLE sensitivity and specificity of each test