Days Set Up
Monday - Friday
Analytic Time

2 - 5 days

MiChart Code
Pyridoxal 5-Phosphate (Vitamin B6) (Sendout)
Soft Order Code

Test Updated:


Pyridoxal Phosphate
Pyridoxal 5-Phosphate Level
Vitamin B6

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Test Overview

Test Methodology

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

Test Usage

Determining vitamin B6 status, including in persons who present with progressive nerve compression disorders, such as carpal tunnel and tarsal tunnel syndromes; determining the overall success of a vitamin B6 supplementation program; and diagnosis and evaluation of hypophosphatasia.

Reference Range

5 - 50 mcg/L

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Collect specimen in a green top tube following an overnight (12-14 hour) fast. Patient should abstain from taking vitamin supplements for 24 hours prior to specimen collection. Centrifuge, aliquot plasma into plastic vial, and refrigerate. Protect specimen from light.

Normal Volume
1 mL plasma
Minimum Volume
0.5 mL plasma

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.