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You are replacing a colleague on vacation and are seeing one of his patients in follow-up. A screening test for HIV has been performed as part of a pre-employment protocol. The enzyme-linked immunosorbent assay (ELISA) was positive. The results of a Western blot analysis (a confirmatory test) will be available in 1 month. The patient is sexually active in a monogamous relationship, and has no other HIV risk factors. He is aware of his ELISA result and wants to know his risk of being infected with HIV. The laboratory that performs the ELISA provides information about the test when used as a screening test in a population similar to that of your patient, with an overall HIV prevalence rate of 1:200. In this population, the sensitivity of the test is 99% and the specificity is 98%. A 2x2 table summarizing the performance characteristics of the test is provided below. ELISA test for HIV Performance characteristics of HIV testing in a known population HIV Disease status 99 1 100 AB CD 396 19400 19796 495 19401 19896 4. What is the probability that this patient has HIV? You do NOT need to show your calculations. You are replacing a colleague on vacation and are seeing one of his patients in follow-up. A screening test for HIV has been performed as part of a pre-employment protocol. The enzyme-linked immunosorbent assay (ELISA) was positive. The results of a Western blot analysis (a confirmatory test) will be available in 1 month. The patient is sexually active in a monogamous relationship, and has no other HIV risk factors. He is aware of his ELISA result and wants to know his risk of being infected with HIV. The laboratory that performs the ELISA provides information about the test when used as a screening test in a population similar to that of your patient, with an overall HIV prevalence rate of 1:200. In this population, the sensitivity of the test is 99% and the specificity is 98%. A 2x2 table summarizing the performance characteristics of the test is provided below. ELISA test for HIV Performance characteristics of HIV testing in a known population HIV Disease status 99 1 100 AB CD 396 19400 19796 495 19401 19896 4. What is the probability that this patient has HIV? You do NOT need to show your calculations.
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Related Book For
Applied Regression Analysis and Other Multivariable Methods
ISBN: 978-1285051086
5th edition
Authors: David G. Kleinbaum, Lawrence L. Kupper, Azhar Nizam, Eli S. Rosenberg
Posted Date:
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