Resistance Test Also known as Genotypic Resistance Assay (GRA)

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A laboratory test to identify which, if any, antiretroviral (ARV) drugs will not be effective against a person’s specific strain of HIV. Resistance testing is done using a sample of blood. There are two types of resistance testing: genotypic and phenotypic. The Genotypic Resistance test (GRA) is the most common test for guiding the selection of an HIV antiretroviral treatment regimen when initiating or changing antiretroviral therapy (ART).