Criteria of screening testAcceptability – The test should be acceptable to population to which it is going to be applied. Repeatability  (reliability, precision, reproducibility)  –  The test must give consistent results when repeated more than once on the same individual or material under the same condition. Validity (accuracy) – It refers to what extent the test accurately measures which it purports to measure. (it means it expresses the ability of a test to separate or distinguish those who have the disease from those who do not). Accuracy refers to closeness with which measured values agree with “true” value.It has two components: i. Sensitivity – Ability of test of identify correctly all those who have disease. ii. Specificity – Ability to test to identify correctly all those who do not have disease.  So, if test gives the same reading for a sample on repeated testing means test is precise (i.e., reliable, reproducible, repeatable).