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Pyridoxal 5'-phosphate (CSF)

CPT: 84207
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Special Instructions

This assay is available in New York State

Specimen Requirements


Cerebrospinal Fluid (CSF)


1.0 mL

Minimum Volume

0.5 mL


Sterile screw capped vial


Collect entire sample into a single sterile tube; FREEZE IMMEDIATELY

Storage Instructions

Freeze immediately after collection, sample stability is limited if left

Stability Requirements

Room Temperature: Not stable; Refrigerated: Not stable; Frozen: 72 hours @ -20C, Indefinitely @ -80C; Freeze/Thaw: None

Causes for Rejection

Bloody CSF; Received thawed

Test Details


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).

CLINICAL: Pyridoxal 5'-phosphate (PLP) (a member 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.



Recommended MNG Kits

CSF Collection Tubes (set of 5 tubes per kit)


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
620034 Pyridoxal 5'-phosphate (CSF) 75056-2 620048 PLPCSF Results 75056-2
620034 Pyridoxal 5'-phosphate (CSF) 75056-2 620049 PLPCSF Interpretation N/A
620034 Pyridoxal 5'-phosphate (CSF) 75056-2 630820 PDF 80563-0