Gabapentin : 3557

Test Code

GABAQ or 3557

Alias/See Also

Neurotin,Neurontin®

CPT Codes
80171

Instructions

Draw sample 2 hours after last dose.

Separate serum or plasma from red cells as soon as possible; pipette or pour into plastic transport tube.

Transport Container

Preferred Specimen
1 mL serum collected in a red-top tube (no gel)

Alternative Specimen
Plasma collected in: EDTA (lavender-top) tube, sodium heparin (green-top) tube or lithium heparin (green-top) tube

Minimum Volume
0.5 mL

Transport Temperature

Refrigerated.

Specimen Stability

Room temperature: 5 days; Refrigerated: 12 days; Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Gross hemolysis, Gel barrier/Serum Separator Tube (SST®)

Methodology
Chromatography/Mass Spectrometry

Setup Schedule

Tuesday - Saturday

Report Available

2-4 days (From receipt at performing Laboratory)

Limitations

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.

Reference Range

2.7-4.1: (peak) following a single dose of 900-1800 mg/day.
4.0-8.5: (peak) following a multiple dose of 900-1800 mg/day administration.

The reference range is evolving. Seizure control has been observed at levels in excess of 4 mcg/mL.

Clinical Significance

Gabapentin is an anticonvulsant drug commonly used as adjunctive therapy to treat partial seizures. Therapeutic drug monitoring is useful to optimize dose and to avoid toxicity.

Performing Laboratory
Quest Diagnostics

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.