The evaluation of bacteria or viruses such as HIV to determine whether they are resistant to the effects of drugs used for treatment. Resistance testing is an important tool to determine whether a pat [..]

Laboratory testing 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. Resistance testing is used to guide selection of an HIV regimen when initiating or cha [..]