Predictive values of a screening test depends on: (A) Prevalence, (B) Sensitivity, (C) Health worker, (D) None of the above
Answer is A. In addition to sensitivity and specificity, the performance of a screening test is measured by its predictive value which reflects the diagnostic power of the test.The predictive accuracy depends upon sensitivity, specificity and disease prevalence.The more prevalent a disease is in a given population, the more accurate will be the predictive value of a positive screening test.Park 23e pg: 140