Coumadin [936Z]

Test Code

CPT Codes

Preferred Specimen
3 mL plasma collected in an EDTA (royal blue-top)

Minimum Volume
1.2 mL

Other Acceptable Specimens
Serum collected in a red-top tube (no gel), or a no additive (royal blue-top) tube • Plasma collected in a sodium heparin (royal blue-top), EDTA (lavender-top), sodium heparin or lithium (green-top) tube

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 72 hours
Refrigerated: 7 days
Frozen: 30 days

High Performance Liquid Chromatography (HPLC)

FDA Status
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the U.S. Food and Drug Administration. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule
Set up: Tues, Thurs, Sat; Report available: 2 days

Reference Range
   1.0-10.0 mcg/mL

Toxic range

     >10.0 mcg/mL
Detection limit



Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.