Ethosuximide (Zarontin®)

Test ID: 

703699

CPT code:

80168

Synonyms:

Zarontin®

Clinical Use:

Evaluate toxicity; monitor therapeutic levels

Specimen Type:

Serum or plasma

Requested Volume: 

1 mL

Minimum Volume: 

0.6 mL

Container Type: 

Red-top tube, lavender-top (EDTA) tube, or green-top (heparin) tube. Do not use a gel-barrier tube. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.

Collection:

Transfer separated serum or plasma to a plastic transport tube. Oral: peak: two to four hours after dose; trough: immediately prior to next dose. Peak or trough levels may be used to monitor therapy because blood levels are fairly constant.

Storage Instructions:

Room temperature

Stability Requirements:

Temperature

Period

Room temperature

14 days

Refrigerated

14 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Rejection Criteria

Gel-barrier tube; hemolysis; lipemia; gross bacterial contamination

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