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Beaumont Laboratory

Quinidine Level

Quinidine Level, Duraquin, Serum, ARUP # 90245, EPIC: LAB6834, SOFT: XQUIN

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube.
Also acceptable: One Dark Green-top Sodium Heparin tube.

Do not use Serum Separator Tubes.
Time of Collection: Trough, just prior to the next dose.
Record the exact time of specimen collection on the tube or in the computer system.

Physician Office/Drawsite Specimen Preparation

Centrifuge to separate serum or plasma from cells. Transfer serum or plasma to plastic transport tube and freeze (-20°C/-4°F or below).

Preparation for Courier Transport

Transport: 1.0 mL serum or plasma, frozen (-20°C/-4°F or below). (Min: 0.5 mL)

Rejection Criteria

  • Serum Separator (SST) tubes.
  • Hemolyzed specimens.
  • Specimens not collected and processed as indicated.


Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 8 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Sendout Laboratory with any questions.


Sent to ARUP Laboratories, Salt Lake City, UT.


Sunday - Saturday.
Results available in 2-4 days.

Reference Range

Therapeutic Range: 1.5-4.5 mcg/mL.
Critical Range: Greater than 10 mcg/mL.

Test Methodology



Quinidine is eliminated by both renal and metabolic processes, therefore kidney or liver disease or advanced age could impair clearance and increase serum or plasma concentrations.

Clinical Utility

Quinidine is a naturally accurring alkaloid which is used to treat both atrial and ventricular arrhythmias cardiac arrhythmias. Quinidine has a narrow therapeutic index and the therapeutic and toxic effects have been shown to be related to quinidine serum concentrations. To obtain optimum therapy, monitoring of serum levels of quinidine in patients receiving the drug is recommended.

CPT Code


Test Codes

ARUP # 90245, EPIC: LAB6834, SOFT: XQUIN

Last Updated


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This directory currently reflects information only for specimens collected and/or processed at the Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.