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 .

Test Details
Analytic Time

10 - 14 days

Soft Order Code
MiChart Code
Pyridoxal 5'-phosphate (CSF)
Reference Laboratory
Medical Neurogenetics (MNG) NC05
Special Testing
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
Additional Information

Test sent to MNG Laboratories.

CPT Code
Fee Code