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Vitamin B6

Pyridoxine, B6, Pyridoxal 5-Phosphate (PLP), Plasma

Test Codes

EPIC: LAB120, Beaker: XVIB6, Warde: VITB6

Department

Send Outs

Instructions

• It is important that the patient fasts for 12-14 hours before specimen collection. No substance except water should be ingested during this time frame. Infant: draw prior to next feeding.
• Individuals should also refrain from ingesting vitamin supplements or alcohol 24 hours prior to drawing the specimen.

Specimen Collection Criteria

Collect: One Lavender-top EDTA tube. 
Alternate Specimen: Red-top tube.

• Critical frozen.
• Protect specimen from light.
• Send specimen for processing immediately after collection.

Physician Office/Draw Specimen Preparation

Critical frozen. Maintain frozen (-20°C/-4°F or below) prior to transport. Protect specimen from light. Centrifuge to separate plasma/serum (within 6 hours) from cells. Transfer plasma/serum to an amber transport tube and freeze (-20°C/-4°F or below) immediately.

Preparation for Courier Transport

Transport: 1.0 mL plasma/serum, frozen (-20°C/-4°F or below). (Minimum: 0.5 mL)

Rejection Criteria

Specimens not collected and processed as indicated.

Inpatient Specimen Preparation

Critical frozen. Maintain frozen (-20°C/-4°F or below) prior to transport.

Protect specimen from light. Deliver specimen to the Laboratory immediately after collection for processing.

In-Lab Processing

Critical frozen. Maintain frozen (-20°C/-4°F or below) prior to transport.

Protect specimen from light. Centrifuge to separate plasma/serum (within 6 hours) from cells. Transfer plasma/serum to an amber transport tube and freeze (-20°C/-4°F or below) immediately.

Transport: 1.0 mL plasma/serum, frozen (-20°C/-4°F or below). (Minimum: 0.5 mL) 

Storage

Specimen Stability for Testing:

Room temperature (20-26°C or 68-78.8°F): Unacceptable
Refrigerated (2-8°C or 36-46°F): Unacceptable
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions. 

Laboratory

Sent to Warde Medical Laboratory, Ann Arbor, MI.

Performed

Monday – Friday.
Results available in 1-4 days.

Reference Range

By report.

Test Methodology

High-Performance Liquid Chromatography (HPLC).

CPT Codes

84207

Contacts

Last Updated

7/21/2024