Test Overview

Test Methodology

Polymerase Chain Reaction (PCR)

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 Test Performed

Monday - Friday

Analytic Time

16 - 21 days

Soft Order Code




HIV Phenotype
Human Immunodeficiency Virus Type 1 Phenotype
PhenoSense HIV Drug Resistance Assay
HIV-1 PhenoSense GT

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Laboratory Reference

Mayo FPGT (91757) (Monogram)

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Specimen Requirements

Offsite 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 Handing

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.

Billing Information

Fee Codes

CPT Code

87900, 87901, 87903, 87904 x11

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