An HIV screening test checks to see if you’ve been infected with the HIV virus. About 1.2 million people in the U.S. have HIV. But about 1 in 7 people don’t know their HIV status, and about 40 ...
Predictive values depend on prevalence of the target analyte. NPVs of HIV tests and testing strategies are always high even if the sensitivity and/or specificity of tests is suboptimal (see text).