<prompt> Diagnostic power of a test is reflected byimage_questionimage_questionimage_questionimage_question  <response>: 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 valuePPV. Diagnostic power of a screening test to correctly exclude a disease: Negative predictive value NPV Ref: Parl 25th edition Pgno: 153 