Test Overview
Test Methodology

Phenotype: PCR amplification and viral culture; Genotype: PCR and DNA sequencing

Test Usage

Review the level of susceptibility or resistance that a person has to each antiretroviral drug in order to design an individualized treatment plan. PhenoSense GT® also includes a measure of replication capacity (RC), sometimes called viral fitness, and HIV-1 subtype.

Reference Range *

Interpretive report provided.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Results of viral load must be greater than or equal to 500 copies/mL.

Test Details
Days Set Up
Sunday - Saturday
Analytic Time

16 - 27 days

Soft Order Code
  • HIV Phenotype
  • Human Immunodeficiency Virus Type 1 Phenotype
  • PhenoSense HIV Drug Resistance Assay
  • HIV-1 PhenoSense GT
  • Phenosense GT
  • HIV-1 Phenotypic and Genotypic Resistance
Reference Laboratory
Mayo FPGT (91757) (Monogram)
Special Testing
Specimen Requirements
Collection Instructions

Collect specimens in sufficient lavender top tubes. Centrifuge within 2 hours of collection at 1000-1200 x g at room temperature for 10-15 minutes. Do not allow samples to remain in centrifuge after centrifugation. Remove plasma from cells immediately and transfer to a plastic screw cap tube. Freeze immediately.

Special Handling

Specimen must be spun, aliquoted and frozen with 2 hours of collection.

Normal Volume
3 mL EDTA plasma
Minimum Volume
1.5 mL EDTA plasma
Additional Information

Test sent to Mayo Medical Laboratories; performed by Monogram Biosciences.

CPT Code
87900, 87901, 87903, 87904 x11