Analytic Time

10 - 14 days

MiChart Code
Pyridoxal 5'-phosphate (CSF)
Soft Order Code

Test Updated:


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Test Overview

Test Methodology


Test Usage

CSF Pyridoxal 5-Phosphate is useful for diagnosis of disorders leading to low CSF levels of this cofactor. This testing may also be used for assessment of Variants of Uncertain Significance (VUS) identified during genetic testing (e.g. Next Generation Sequencing or Capillary Sequencing Testing). Pryridoxal 5'phosphate (PLP) (a memeber of the vitamin B6 family) is required as a cofactor for over 100 different enzymes in the body. These may involve the metabolism of various neurotransmitters and amino acids. Inadequate PLP may occur due to genetic, nutritional deficiencies as well as reaction with various drugs. Inherited disorders that affect the CSF PLP level include pyridox(am)ine phosphate oxidase (PNPO) deficiency, alpha aminoadipic semialdehyde dehydrogenase deficiency, hyperprolinermia type 2 and hypophoshatasia due to alkaline phosphatase deficiency .

Reference Range

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

Specimen Requirements


Collect samples into 5 numbered 2.0 mL microcentrifuge tubes (or similar): Tube 1: 0.5 mL, Tube 2: 1.0 mL, Tube 3: 1.0 mL, Tube 4: 1.0 mL, Tube 5: 1.0 mL OR collect entire sample into a single sterile tube, which is considered a pooled CSF sample. Freeze.

Normal Volume
4.5 mL CSF
Minimum Volume

Billing Information

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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.