Test Code 0248781 Gabapentin, Serum
Additional Codes
Mayo Test ID |
---|
GABA |
Performing Laboratory

Useful For
Monitoring serum gabapentin concentrations Assessing compliance Adjusting dosage in patientsMethod Name
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)Reporting Name
Gabapentin, SSpecimen Type
Serum RedSpecimen Required
Container/Tube: Red top
Specimen Volume: 1 mL
Collection Instructions:
1. Draw specimen immediately before next scheduled dose.
2. Spin down within 2 hours of draw.
Specimen Minimum Volume
0.2 mL
Specimen Stability Information
Specimen Type | Temperature | Time |
---|---|---|
Serum Red | Refrigerated (preferred) | 28 days |
Ambient | 28 days | |
Frozen | 28 days |
Reject Due To
Hemolysis |
Mild OK; Gross OK |
Lipemia |
Mild OK; Gross OK |
Icterus |
Mild OK; Gross OK |
Other |
Serum gel tube or whole blood |
Reference Values
2.0-20.0 mcg/mL
Toxic Range: ≥25.0 mcg/mL
Interpretation
Therapeutic ranges are based on specimens drawn at trough (ie, immediately before the next dose).
Most individuals display optimal response to gabapentin with serum levels of 2 to 20 mcg/mL. Some individuals may respond well outside of this range, or may display toxicity within the therapeutic range; thus, interpretation should include clinical evaluation. Some patients require high doses to achieve response, resulting in concentrations as high as 80 mcg/mL. Dosage reduction should be based on signs of toxicity, not the serum concentration.
Day(s) and Time(s) Performed
Tuesday through Saturday; 12 a.m.,Saturday; 4 p.m.
Analytic Time
Same day/1 daySpecimen Retention Time
2 weeksTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
80171
LOINC Code Information
Test ID | Test Order Name | Order LOINC Value |
---|---|---|
GABA | Gabapentin, S | 9738-6 |
Result ID | Test Result Name | Result LOINC Value |
---|---|---|
80826 | Gabapentin, S | 9738-6 |
Forms
If not ordering electronically, complete, print, and send a Neurology Specialty Testing Client Test Request (T732) with the specimen.