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Lactate (CSF)

CPT: 83605
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Specimen Requirements


Specimen

Cerebrospinal Fluid (CSF)

Volume

1 mL

Minimum Volume

0.5 mL

Container

Sterile screw capped vial

Collection

Collect entire sample into a single sterile tube

Storage Instructions

Freeze as soon as possible after collection; Ship within 24 hours. Ship samples priority overnight on 3-4 lbs of dry ice. Sample must arrive in our lab Monday - Saturday. We do NOT accept Sunday or holiday deliveries.

Stability Requirements

Room Temperature: Not stable; Refrigerated: 24 hours; Frozen: 72 hours @ -20C, Indefinitely @ -80C; Freeze/Thaw: None

Causes for Rejection

Bloody CSF; Received thawed

Test Details


Use

CSF Lactate is useful for investigating possible disorders of mitochondrial metabolism, when used in conjunction with cerebrospinal fluid pyruvate collected at the same time to determine the Lactate:Pyruvate ratio. The CSF Lactate:Pyruvate ratio is considered a helpful (not diagnostic) tool in the evaluation of patients with possible disorders of mitochondrial metabolism, especially in patients with neurologic dysfunction and normal blood Lactate:Pyruvate ratios. Pyruvic acid levels alone have little clinical utility. CLINICAL The Lactate:Pyruvate ratio is elevated in several, but not all, mitochondrial respiratory chain disorders. Mitochondrial disorders vary widely in presentation and age of onset. Many mitochondrial disorders have neurologic and myopathic features and may involve multiple organ systems. Determination of lactate, pyruvate, and L:P ratio in cerebrospinal fluid is helpful in directing attention toward a possible mitochondrial disorder in cases with predominantly neurologic dysfunction and normal blood lactate levels. An elevated Lactate:Pyruvate ratio may indicate inherited disorders of the respiratory chain complex, tricarboxylic acid cycle disorders and pyruvate carboxylase deficiency. Respiratory chain defects usually result in Lactate:Pyruvate ratios >20. A low Lactate:Pyruvate ratio (disproportionately elevated pyruvic acid) may indicate an inherited disorder of pyruvate metabolism. Defects of the pyruvate dehydrogenase complex result in Lactate:Pyruvate ratios <10. The Lactate:Pyruvate ratio is characteristically normal in other patients. An artifactually high ratio can be found in acutely ill patients.

Methodology

Enzyme/UV

Recommended MNG Kits

CSF Collection Tubes (set of 5 tubes per kit)

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
620044 Lactate CSF 2520-5 620064 LACCSF Results 2520-5
620044 Lactate CSF 2520-5 620065 LACCSF Interpretation N/A
620044 Lactate CSF 2520-5 630826 PDF 80563-0