0.0445 Enzyme tests are accurate but is not always correct. Here are approximate
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Question
0.0445 Enzyme tests are accurate but is not always correct. Here are approximate probabilities of positive and negative test results when the blood tested does and does not actually contain anebodies to HIV Test Result are present o antibodies are absent (a) What is the probability that a person has the 0 0200 tibody, given that test is positive? Explain in your own words what this means. how likely it is that someone has HIV if that randomly chosen person has recelved a positive test resuit that someone does not have HIV If that randomly chosen persen has received a postive test resuit (b) Identify the test's sensitivity, specificity, and positive predictive value specificity positive predictive value 74 of being positive if stereids have been used. what is the probability that neither test is positive if steroids have been usedExplanation / Answer
a) P( Disease/Positive) = 0.9985/[0.9985+0.0080]=0.9920
b) The conditional probability tells us how likely someone has HIV if he has received positive test results.
c) Sensitiviy = 0.9985/[0.9985+0.0015]=0.9985
Specificity = 0.9920/1=0.9920
PPV = 0.9985/[0.9985+0.0080]=0.9920
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