ARUP's Laboratory Test Directory

Methsuximide and Normethsuximide : 0090146

Mnemonic: METHSUX

Methodology: Quantitative Gas Chromatography
Performed: Mon, Thu
Reported: 1-5 days
Specimen Required: Collect: Plain red. Also acceptable: Lavender (K2 or K3EDTA) or pink (K2EDTA).

Specimen Preparation: Separate serum or plasma from cells within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Whole blood. Gel separator tubes, light blue (citrate), or yellow (SPS or ACD solution).

Stability (collection to initiation of testing): After separation from cells: Ambient: 5 days; Refrigerated: 2 weeks; Frozen: 1 month
Reference Interval:
Effective February 19, 2013
 
Therapeutic Range Total (methsuximide and normethsuximide): 10-40 µg/mL
Therapeutic Range Methsuximide: < 1 µg/mL
Therapeutic Range Normethsuximide: 10-40 µg/mL
Toxic Level Total (methsuximide and normethsuximide): > 60 µg/mL

CPT Code(s): 83858; 80299
Cross References: Celontin (Methsuximide & Normethsuximide), Desmethylmethsuximide (Methsuximide & Normethsuximide), Methsuximide and Metabolite (Methsuximide & Normethsuximide), Normethsuximide (Methsuximide & Normethsuximide)