Diazepam

Valium®, Diastat®

8 days

Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

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Measures diazepam levels in serum. Used for therapeutic monitoring or overdose investigation.

Serum or Plasma

1 mL

Red-top tube, lavender-top (EDTA) tube, or green-top (heparin) tube.

No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.

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.