HIV Genotyping, Resistance, Tropism and HLA-B*57:01 Abacavir Hypersensitivity Testing
Conformément au Règlement de l’Ontario 671/92 de la Loi sur les services en français, les renseignements d’analyses de laboratoire liés à la présente page ne sont offerts qu’en anglais parce qu’ils sont de nature scientifique ou technique et destinés uniquement à l’usage des fournisseurs de soins de santé qualifiés et non aux membres du public.
Testing Indications
HIV infected patients receiving antiretroviral therapy with rising plasma viral loads of greater than 250 copies/mL could benefit from drug-resistance testing to establish HIV-sensitivity to the antiretroviral drugs they are receiving.
With drug-resistance data, physicians can rationally select a new combination therapy for their patients.
HIV Drug Resistance and Integrase Resistance testing are added automatically for baseline genotyping to naïve patients considering starting antiretroviral treatment. The eligibility for HIV Baseline genotyping is when the HIV Viral Load > 250 copies /mL.
Specimen Requirements
| Test Requested | Required Requisition(s) | Specimen Type | Minimum Volume | Collection Kit |
HIV Drug Resistance Testing |
Not Required2,3 |
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Integrase Resistance Testing |
Not Required2,3 |
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Gp-41 Resistance Testing |
Not Required2,3 |
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V3 Genotyping (Tropism/ CCR5) |
Not Required2,4 |
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Proviral HIV DNA Tropism (V3) |
EDTA Whole blood |
5 mL EDTA whole blood |
EDTA whole blood |
|
HLA-B*57:01 Abacavir Hypersensitivity |
EDTA Whole blood |
5 mL EDTA whole blood |
EDTA whole blood |
Submission and Collection Notes
Fax completed Public Health Ontario laboratory HIV Genotyping, Resistance, Tropism, and HLA-B*57:01 Abacavir Hypersensitivity Testing to HIV , Toronto Public Health Ontario Laboratory at 416 235-6194 or 416 235-6197.
PHL will use the specimen submitted for HIV Viral Load testing.
Eligibility for HIV Drug Resistance, Integrase Resistance, and gp41 Resistance: HIV Viral Load must be >250 copies/mL
Eligibility for V3 Genotyping (Tropism/CCR5): HIV Viral Load must be >500 copies per mL
Storage and Transport
Label the specimen container with the patient’s full name, date of collection and one other unique identifier such as patient’s date of birth or Health Card Number. Failure to provide this information may result in rejection or testing delay.
Special Instructions
EDTA whole blood must be shipped in ice packs within 24 hours of collection.
Test Frequency and Turnaround Time (TAT)
These tests are referred to the British Columbia Centre for Excellence (BCCfE), 613-1081 Burrard St. Vancouver B.C. Samples, and are shipped weekly on Mondays.
Turnaround time is up to 21 days from receipt by the PHO laboratory
BCCfE uses a genotypic sequencing system that identifies mutations in the reverse transcriptase and protease genes that encode drug resistance. BCCfE uses HIV Envelope Sequencing for T-20 Resistance, HIV Integrase Sequencing for Resistance to Integrase Inhibitors and V3 Genotyping for Coreceptor Tropism. HLA-B*57:01 screening test can be ordered before the start of a therapeutic regimen containing Abacavir.
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