Answered: Enzyme immunoassay tests are used to…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question

Enzyme immunoassay tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Approximate probabilities of positive and negative test results when the blood tested does and does not actually contain antibodies to HIV are given in the table.

	Test Result
	Positive	Negative
Antibodies present	0.9985	0.0015
Antibodies absent	0.0060	0.9940

Suppose that 1%1% of a large population carries antibodies to HIV in their blood.

Probabilities from trials with 2897 people known to be free of HIV antibodies and 673 people known to be infected, reported in J. Richard George, "Alternative specimen sources: methods for confirming positives," 1998 Conference on the Laboratory Science of HIV, found online at the Centers for Disease Control and Prevention, www.cdc.gov.

(b) What is the probability that the test is positive for a randomly chosen person from this population? Give your answer to six decimal places.

?(positive)=

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