Probability that a person out of those tested positive on a screening test has in fact the disease is known as
Correct Answer: Positive predictive value
Description: Sensitivity Ability of test to identify correctly all those who have the disease, that is "true positive". Specificity Ability of test to identify correctly all those who don't have the disease, that is "true negative". Positive predictive value Probability that subjects with a positive screening test truly have the disease. Negative predictive value Probability that subjects with a negative screening test truly don't have the disease. Screening test results by Diagnosis Screening test results Diagnosis Total Positive a (True - positive) b (False-positive) a+b Negative c (False - negative) d (True - negative) c +d Total a+c b+d a+b+c+d Sensitivity = a/(a + c) x 100 Specificity = d/(b+d) x 100 Positive Predictive Value = a/(a + b) x 100 Negative Predictive Value = d/(c + d) x 100
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Social & Preventive Medicine
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