At a Glance Why Get Tested? If you have been diagnosed with
human immunodeficiency virus (HIV) and will be receiving anti-
retroviral therapy, or if you are receiving anti-retroviral
therapy that is not effective When to Get Tested? When first
diagnosed with HIV and/or immediately prior to the start of
anti-retroviral therapy, or if your HIV viral load rises
steadily even though you are receiving anti-retroviral therapy A
blood sample drawn from a vein in your arm Test Preparation
Needed? The Test Sample What is being tested? Resistance is a
term used to describe the condition in which a microorganism is
able to grow and/or multiply in the presence of one or more
antimicrobial drugs. Human immunodeficiency virus (HIV)
genotypic resistance testing evaluates the likelihood that the
HIV strain infecting an individual has developed resistance to
drug treatment. Resistance can develop when antimicrobials are
used to treat an infection and a mutation or change occurs in
one of the microorganism's genes. This change