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Vitamin K [36585X]Test Code
3 mL plasma collected in an EDTA (lavender-top) tube
Other Acceptable Specimens
Plasma collected in: lithium heparin (green-top) tube
Separate and freeze immediately in plastic screw-cap vial. Wrap sample in foil before sending to lab. No disclaimer is required.
Note: Samples received frozen but not protected from light are acceptable. Samples received refrigerated but not protected from light are unaccpetable and should be rejected.
Plastic screw-cap vial, protected from light
Room temperature: Unacceptable
Frozen: 90 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Received refrigerated • Serum
High Performance Liquid Chromatography (HPLC)
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by the FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Vitamin K is a required co-factor for the synthesis of factors 2, 7, 9, and 10 and proteins C and S. Deficiencies of vitamin K lead to bleeding. Coumadin® (warfarin) acts as an anticoagulant because it is a vitamin K antagonist.
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153