Diagnostic power of a test is reflected by

Diagnostic power of Screening test: Predictive accuracy (it tells the actual no.of people having the disease or not having the disease out of those shown positive or negative by a screening test, respectively) Diagnostic power of a screening test to correctly identify a disease: Positive predictive value(PPV). Diagnostic power of a screening test to correctly exclude a disease: Negative predictive value (NPV) Ref: Parl 25th edition Pgno: 153