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Drug Monitoring, Gabapentin, Quantitative, Urine
Test Code39407
CPT Codes
80355 (HCPCS: G0480)
Includes
If you require medMATCH for this order code, you must also order code 39158 - Prescribed Drugs, medMATCH®. If 39158 is ordered, all Drug Monitoring order codes will be treated as medMATCH.
If this test code is not ordered with 39158, all medMATCH result codes will be DNR’d.
If this test code is not ordered with 39158, all medMATCH result codes will be DNR’d.
Preferred Specimen
3 mL urine in a clinical drug test transport vial
Minimum Volume
2 mL
Other Acceptable Specimens
Urine collected in urine collection container
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 30 days
Refrigerated: 14 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Preserved samples
Methodology
Mass Spectrometry (MS)
FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Tues-Sat; Report available: Next day
Clinical Significance
Gabapentin is used as an anticonvulsant in the management of neuropathic pain in adults and as adjunctive therapy in the treatment of partial seizures in patients with epilepsy. The test is a definitive assay using liquid chromatography mass spectroscopy (LC/MS/MS) methodology. Therapeutic urine drug monitoring of gabapentin is important for ensuring compliance to treatment strategies. Urine or oral fluid are the specimens of choice for routine monitoring of patients taking prescription drugs. Use of serum/plasma should be limited to anuretic patients, or where a patient's clinical appearance does not coincide with their prescribed medications. No single monitoring approach provides adequate information about the pattern or dose of patient drug use. Safest prescribing habits should include a combination of tools and laboratory test results to correctly detect drug use patterns. Quantitative values cannot be used to assess the drug dose, because the drug is extensively metabolized and excreted in the urine.
