Vitamin B6, Plasma

*Protect from light.

Test Code

Alias/See Also

CPT Codes

Preferred Specimen
1 mL frozen plasma collected in an EDTA (lavender-top) tube - protected from light

Patient Preparation
Overnight fasting is required

Minimum Volume
0.5 mL

Separate cells within 6 hours by centrifugation at 2-8° C (2200-2500 RPM, 800-1000 g) for 5-10 minutes. Transfer plasma to an amber polypropylene or polyethylene transport tube to protect from light. Alternately, neutral color polypropylene or polyethylene tube can be used if wrapped in aluminum foil. Freeze the tubes at -10 to -30° C. Ship frozen.

Transport Container
Amber transport tube

Transport Temperature

Specimen Stability
Room temperature: 6 hours
Refrigerated: 12 hours
Frozen -20° C: 6 days
Frozen -70° C: 42 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis • Lipemia • Received room temperature • Received refrigerated • Not light protected

Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

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 FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.

Setup Schedule
8: 00 a. M. Sun-fri

Report Available
1-4 days

Reference Range
0-1 year Not established
2-17 years 3.0-35.0 ng/mL
≥18 years 2.1-21.7 ng/mL

Clinical Significance
Test is used to determine vitamin B6 deficiency or overdosage, for monitoring treatment, and to evaluate wellness and health.

Performing Laboratory
Quest Diagnostics Nichols Institute
27027 Tourney Road
Valencia, CA 91355-5386

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.