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Chapter 38, Question 1.
Diagnostic tests for HIV

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A simple routine test for the presence of HIV was carried out on 300 high risk subjects (intravenous drug users). A more accurate but time-consuming and expensive test (the 'gold standard') was also carried out on the subjects to assess the accuracy of the routine test. The following results were obtained:

		HIV by 'gold standard'
		Yes	No	Total
Routine test	+ve	92	10	102
	-ve	2	196	198
	Total	94	206	300

Select all of the following statements which you believe to be true.

The sensitivity of the test is 90.2%
The specificity of the test is 97.9%
The estimated prevalence of HIV in the relevant population is 0.31
The positive predictive value of the test is 97.9%.
The negative predictive value of the test is 99.0%.