<prompt> Amount of previously unrecognized disease which is diagnosed by screening effort, is -YieldSensitivitySpecificityPPV  <response>: Yield of the screening test: Is the amount of previously unrecognized disease that is diagnosed as a result of screening effort.Yield of the screening test depends on:Sensitivity of screening test.Specificity of screening test.Prevalence of the disease in population.Participation of individuals in the detection programme.Yield of a screening test increases by: selecting high risk population for screening. 