<prompt> ELISA is performed on a population with low prevalence, What would be the result of performing double screening ELISA tests-Increased sensitivity and positive predictive valueIncreased sensitivity and negative predictive valueIncreased specificity and positive predictive valueIncreased specificity and negative predictive value  <response>: Ref: Parks 23rd edition pg 139 Double ELISA meaning screening test is done in series. Series screening test : Sensitivity decreases Specificity increases PPV increases NPV decreases 