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HelpTest ID 2C9QT Cytochrome P450 2C9 Genotype, Varies
Ordering Guidance
If patient is or will be using warfarin, the preferred test is WARSQ / Warfarin Response Genotype, Varies, which includes testing of CYP2C9, VKORC1, CYP4A2, and rs12777823.
Testing is available as the single gene assay (this test) or as a part of a focused pharmacogenomics panel, which includes testing for the following genes: CYPs 1A2, 2C9, 2C19, 2D6, 3A4, 3A5, 4F2, SLCO1B1, and VKORC1.
If multiple pharmacogenomic genotype testing is needed, order PGXQP / Focused Pharmacogenomics Panel, Varies.
Specimen Required
Multiple genotype tests can be performed on a single specimen after a single extraction. See Multiple Genotype Test List for a list of tests that can be ordered together.
Submit only 1 of the following specimens:
Specimen Type: Whole blood
Container/Tube: Lavender top (EDTA)
Specimen Volume: 3 mL
Collection Instructions:
1. Invert several times to mix blood.
2. Send whole blood specimen in original tube. Do not aliquot.
Specimen Stability Information: Ambient (preferred) 9 days/Refrigerated 30 days
Specimen Type: Saliva
Patient Preparation: Patient should not eat, drink, smoke, or chew gum 30 minutes prior to collection.
Supplies: Saliva Swab Collection Kit (T786)
Specimen Volume: 1 Swab
Collection Instructions: Collect and send specimen per kit instructions.
Specimen Stability Information: Ambient 30 days
Specimen Type: Extracted DNA
Container/Tube: 2-mL screw top tube
Specimen Volume: 100 mcL (microliters)
Collection Instructions:
1. The preferred volume is 100 mcL at a concentration of 50 ng/mcL.
2. Provide concentration of DNA and volume on tube.
Specimen Stability Information: Frozen (preferred)/Ambient/Refrigerated
Forms
1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available:
-Informed Consent for Genetic Testing (T576)
-Informed Consent for Genetic Testing-Spanish (T826)
2. If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Neurology Specialty Testing Client Test Request (T732)
-Therapeutics Test Request (T831)
Useful For
Identifying individuals who may be at risk for altered metabolism of drugs that are modified by cytochrome P450 2C9
Special Instructions
Method Name
Real-Time Polymerase Chain Reaction (PCR) with Allelic Discrimination Analysis
Reporting Name
CYP2C9 Genotype, VSpecimen Type
VariesSpecimen Minimum Volume
Blood: 0.4 mL
Saliva, extracted DNA: see Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Varies | ||
Reference Values
An interpretive report will be provided.
Day(s) Performed
Monday through Friday
Report Available
3 to 8 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
81227
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| 2C9QT | CYP2C9 Genotype, V | 46724-1 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 610096 | CYP2C9 Genotype | 46724-1 |
| 610097 | CYP2C9 Phenotype | 79716-7 |
| 610568 | CYP2C9 Activity Score | 104668-9 |
| 610098 | Interpretation | 69047-9 |
| 610099 | Additional Information | 48767-8 |
| 610100 | Method | 85069-3 |
| 610101 | Disclaimer | 62364-5 |
| 610102 | Reviewed by | 18771-6 |