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Geno- and phenotypic resistance tests.


 There are two types of experimental drug resistance tests, genotypic and phenotypic, that may be able to determine a person's level of resistance to certain HIV drugs. Genotypic resistance testing seeks mutations in the genetic structure of HIV. The analysis is typically conducted from a blood test, and several methods may be used to read the blood sample including a machine that reads gene sequences, a line probe assay, and the GeneChip, which scans blood samples into a computer. Phenotypic resistance testing assesses the quantity of a drug necessary to suppress the virus in a laboratory setting. Both tests require a patient to have a viral load over 1,000 HIV RNA copies, and both are relatively expensive. Neither test can predict which treatments will definitely be successful, as the results are likely to be subjective, depending on the laboratory. Pros and cons for each type of test are listed. Availability, cost, and contact information are provided.
