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Test Directory

Test Directory Vitamin K

Vitamin K

Test Summary

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.

Aliases

Specimen Collection

Special Instructions

N/A

Preferred Specimen

1 mL plasma collected in an EDTA (lavender-top) tube - protect from light

Minimum Volume

0.5 mL

Instructions

See Vitamin Collection Link

Patient Preparation

Fasting for a minimum of 8 hours required. Patient should refrain from eating liver and taking multivitamins or vitamin K at least 24 hours before sample collection.

Storage

Amber transport tube, light protected

Transport Temperature

Frozen

Specimen Stability

Room temperature: 24 hours
Refrigerated: 24 hours
Frozen: 90 days

Limitations

N/A

Other Acceptable Specimens

Frozen serum - protect from light.
Frozen plasma collected in a sodium or lithium heparin (green-top) tube - protect from light.

Unacceptable Specimens

Grossly lipemic • Gross hemolysis

Order Code

VITK

EPIC (Premier) Code

LAB3861

Includes

N/A

CPT Code

84597

Billing Code

670914

CPT Statement

Methodology

Chromatography/Mass Spectrometry

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. The FDA has determined that such clearance or approval is not necessary. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Physician Attestation of Informed Consent

N/A

Testing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly VA, 20153

Department

Reference Testing

Reference Range

130-1500 pg/mL

Setup Schedule / Expected Turnaround Time

Monday - Thursday, Saturday; Report available: 3 - 4 days

Resources

Vitamin Chart