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Order Code CH701
Turnaround Time 4 days
Test Includes


Specimen Requirements
Specimen Source
Serum, Plasma
Transport Container
(Specimen Container)

Red-top tube (no gel)
Alternative Specimen(s): Plasma collected in EDTA (lavender top) tube, sodium heparin (green-top) tube or lithium heparin (green-top) tube

Preferred Specimens
Minimum Volume (uL)
.5 mL
Collection Instructions
(Transport Temperature)
Transport at Room Temperature
Specimen Stability
Temperature Period
Room temperature 5 days
Refrigerated 12 days
Frozen 30 days
Reject Criteria

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

Special Instructions

Separate serum or plasma from red cells as soon as possible; pipette or pour into plastic transport tube.
Draw sample 2 hours after last dose. Transport Room temperature.

Test Details
Chromatography/Mass Spectrometry_x000D_
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.

Reference Ranges

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.