Ordering Recommendation

Use to assess genetic risk of abnormal drug metabolism for CYP2B6 substrates. May aid in drug selection and dose planning for drugs metabolized by CYP2B6.

Mnemonic

2B6GENO

Methodology

Polymerase Chain Reaction/Fluorescence Monitoring

Performed

Varies

Reported

5-10 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation
Collect

Lavender (EDTA), Pink (K2EDTA), or Yellow (ACD Solution A or B).

Specimen Preparation

Transport 3 mL whole blood. (Min: 1 mL)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Plasma or serum. Specimens collected in sodium heparin or lithium heparin.

Remarks
Stability

Ambient: 72 hours; Refrigerated: 1 week; Frozen: 1 month

Reference Interval

By report

Interpretive Data

Background Information for CYP2B6:
Characteristics:
The cytochrome P450 (CYP) isozyme 2B6 is involved in the metabolism of many drugs. Variants in the gene that codes for CYP2B6 may influence pharmacokinetics of substrates and may predict or explain nonstandard dose requirements, therapeutic failure, or adverse reactions.
Inheritance:
Autosomal codominant
Cause:
 CYP2B6 gene variants affect enzyme function.
Variants Tested:
See the "Additional Technical Information" document.
Clinical Sensitivity:
Drug dependent.
Methodology:
Polymerase chain reaction (PCR) and fluorescence monitoring
Analytical Sensitivity and Specificity: Greater than 99 percent
Limitations:
Only the targeted CYP2B6 variants will be detected by this test, and assumptions about phase and content are made to assign alleles. Publicly available sources such as the www.pharmvar.org or www.pharmgkb.org provide guidance on phenotype predictions and allele frequencies. Diagnostic errors can occur due to rare sequence variations. Risk of therapeutic failure or adverse reactions with CYP2B6 substrates may be affected by genetic and nongenetic factors that are not detected by this test. This result does not replace the need for therapeutic drug or clinical monitoring.

Please note the information contained in this report does not contain medication recommendations and should not be interpreted as recommending any specific medications. Any dosage adjustments or other changes to medications should be evaluated in consultation with a medical provider.
 

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the U.S. Food and Drug Administration. This test was performed in a CLIA-certified laboratory and is intended for clinical purposes.

Counseling and informed consent are recommended for genetic testing. Consent forms are available online.

Compliance Category

Laboratory Developed Test (LDT)

Note

Whole blood is the preferred specimen. Saliva samples that yield inadequate DNA quality and/or quantity will be reported as inconclusive if test performance does not meet laboratory-determined criteria for reporting.

Hotline History

N/A

CPT Codes

81479

Components

Component Test Code* Component Chart Name LOINC
3004492 2B6 Specimen 66746-9
3004493 CYP2B6 Genotype 72882-4
3004494 CYP2B6 Phenotype 79720-9
3004495 2B6 Interpretation 77202-0
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • 2B6
  • bupropion
  • CYP2B6
  • Cytochrome P450 2B6
  • efavirenz
  • methadone
  • nevirapine
CYP2B6