ELISA test has sensitivity of 95% and specificity of 95%. Prevalence of HIV carries is 5%. The predictive value of positive test is-
Ref:Parks 23rd edition pg 139 Construct a 2x2 table using the above data. 4.75 4.75 0.25 9.25 PPV = TP / (TP + FP) = 4.75/(4.75+4.75)=0.5
95%
50%
100%
75%
Screening