Vitamin B6 (Pyridoxal 5-Phosphate)
Also known as: VIT B6
Use
This test is used for the nutritional assessment of vitamin B6, which is essential for numerous functions, including amino acid metabolism, neurotransmitter synthesis, and hemoglobin synthesis. Pyridoxal 5'-phosphate, the biologically active form of vitamin B6, reflects the body’s vitamin B6 status. Measurement after fasting provides an accurate representation of vitamin B6 levels in the body.
Special Instructions
Collect specimen after an overnight fast. Protect specimens from light during collection, separation, and storage. After collection, plasma or serum should be separated from cells within 1 hour and transferred to an ARUP Amber Transport Tube.
Limitations
Non-fasting specimen concentrations may reflect recent vitamin intake rather than true nutritional status. Whole blood specimens are unsuitable for this test. Specimens must be protected from light due to photo-sensitivity. Icteric specimens may also be unsuitable. The test has not been cleared or approved by the FDA and is performed as a laboratory-developed test for clinical purposes.
New York Approved
Methodology
Mass Spectrometry
Biomarkers
LOINC Codes
- 62236-5
Result Turnaround Time
1-5 days
Related Documents
For more information, please review the documents below
Specimen
Plasma
Volume
1 mL
Minimum Volume
0.5 mL
Container
ARUP Amber Transport Tube
Collection Instructions
After an overnight fast, collect in a Green (Sodium or Lithium Heparin), Lavender (EDTA), Pink (K2 EDTA), Plasma Separator Tube (PST) or Plain Red. Separate plasma or serum from cells within 1 hour and transfer.
Patient Preparation
Collect specimen after an overnight fast.
Storage Instructions
Frozen
Causes for Rejection
Whole blood, specimens not protected from light, icteric specimens.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 3 Hours |
| Refrigerated | 1 week |
| Frozen | 2 months |
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