<prompt> The purpose of screening test-To diagnose the casesTo so out persons who are at increased riskTo segregate diseased and non diseased personsNone  <response>: .four main uses of screening inc ludes case detection ,control of disease,reserch purposes,educational oppounities.screening also helps in the soing out of people who are at a higher risk.ref:park;s textbook of preventive and social medicine,22 nd edition,pg no128 