Flurazepam and Desalkylflurazepam, Serum or Plasma

CPT: 80346
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Test Details


  • Dalmane®


Therapeutic drug management


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

Reference Interval

Flurazepam: 0−30 ng/mL; desalkylflurazepam: 30−150 ng/mL; combined total: 30−180 ng/mL

Specimen Requirements


Serum or plasma, frozen


2 mL

Minimum Volume

0.5 mL


Red-top tube or green-top (heparin) tube. Gel-barrier tubes are not recommended.

Patient Preparation

Trough levels are most reproducible.


Serum or plasma should be separated from cells immediately. Transfer separated serum or plasma to a plastic transport tube and freeze immediately.

Storage Instructions

Freeze immediately; ship on dry ice.

Causes for Rejection

Gel-barrier tubes; sample not received frozen


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
808455 Flurazepam (Dalmane) 790417 Flurazepam ng/mL 46979-1
808455 Flurazepam (Dalmane) 810914 Desalkylflurazepam ng/mL 46980-9
808455 Flurazepam (Dalmane) 790419 Flurazepam +Desalkylflurazepam ng/mL 73826-0

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