Vitamin K
Test code
CPT code(s)*
Test resources
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Details
Methodology
Chromatography/Mass Spectrometry
Assay category
This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Specimen requirements | |
|---|---|
| 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. |
| Preferred specimen(s) | 1 mL frozen plasma collected in an EDTA (lavender-top) tube - protected from light |
| Alternative specimen(s) | Frozen plasma collected in: Sodium heparin (green-top) tube - protected from light or lithium heparin (green-top) tube - protected from light • Frozen serum - protected from light |
| Minimum volume | 0.5 mL |
| Collection instructions | Centrifuge within 1 hour of collection. Immediately separate plasma or serum from the cells into an amber transport tube to protect from light. Freeze. Do not thaw. Samples received frozen but not protected from light are acceptable. If unable to centrifuge immediately, sample should be covered with aluminum foil immediately and placed on ice until plasma or serum can be separated from cells. Transport plasma or serum to the laboratory frozen. |
| Transport container | Amber transport tube |
| Transport temperature | Frozen |
| Specimen stability | Room temperature: 24 hours Refrigerated: 24 hours Frozen: 90 days |
| Reject criteria | Gross hemolysis • Grossly lipemic • Received room temperature • Received refrigerated |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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