- Seneitivity= the ability of the test to diagnose the disease in its presence: i.e. = true positive / all positive by the refernce test (TP+FN)
- Specificity= the ability of the test to exclude the disease in its absence. i.e = true negative/ all negative by the reference test(TN+FP)
- Positive predictive value= [TP/ all positive by the screening test(TP+FP) ]x 100
- negative ,, ,, = [TN/all negative by ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,( TN+FN)]X100
- DIAGNOSTIC ACCURACY = [(TP+TN)/all studied (TP+FP+TN+FN)]X 100
true positive (TP)= positive by screeninig test and by reference test
True negative (TN)= negative by screeninig test and by reference testfalsepositive (FP)= positive by screening test BUT negative by reference test
false negative (FN)= negativeby screening test BUT positive by reference test
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