Scroll back to top

Pyridoxal 5'-phosphate (CSF)

CPT: 84207
Updated on 05/1/2020

Specimen Requirements


Specimen

Cerebrospinal Fluid (CSF)


Volume

1.0 mL


Minimum Volume

0.5 mL


Container

Sterile screw capped vial


Collection

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


Use

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 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.


Methodology

HPLC/Fluorescence

HPLC

HPLC/Fluorescence


Recommended MNG Kits

CSF Collection Tubes (set of 5 tubes per kit)