Test Overview
Test Methodology

Gas Chromatography/Flame Ionization Detection (GC-FID)

Test Usage

Therapeutic drug monitoring.

Reference Range *

10 - 40 mcg/mL. Critical Value: 55 mcg/mL.

Test Details
Days Set Up
Daily
Analytic Time

5 - 7 days

Soft Order Code
MSX
MiChart Code
Methsuximide
Synonyms
  • Celontin
  • Desmethylmethsuximide
  • MSX
Laboratory
Sendout
Reference Laboratory
Mayo FMETX (91822) (MedTox 78)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect blood in red or green top tube; do not use SST or PST tube. Centrifuge, aliquot serum or plasma into a plastic vial and refrigerate or freeze.

Rejection Criteria
SST or PST tube not acceptable.
Yellow Top Tube
Red Top Tube
Normal Volume
2 mL serum or plasma
Minimum Volume
0.3 mL serum or plasma
Storage Temperature
Refrigerated preferred, frozen acceptable
Additional Information

Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

Billing
CPT Code
80339
Fee Code
20413
NY State Approved
No