Find Locations
For hours, walk-ins and appointments.Expected Turnaround Time
10 - 14 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
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.
Storage Instructions
Freeze as soon as possibe after collection.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | Unstable (stability provided by manufacturer or literature reference) |
Refrigerated | 24 hours (stability provided by manufacturer or literature reference) |
Frozen | -20°C = 72 hours; -80°C = Indefinite (stability provided by manufacturer or literature reference) |
Causes for Rejection
Bloody CSF; received thawed
Test Details
Use
CSF Lactate is useful for investigating possible disorders of mitochondrial metabolims, when used in conjenction 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 neurolofic dysfunction and normal blood Lactate:Pyruvate ratios. Pyruvic acid levels alone have little clinical utility. The Lactate:Pyruvate ratio is elevated in several, but not all, mitochondrial disorders vary widely in presentation and age of onset. Many mitochondral 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 predominately neurologic dysfunction and normal blood lactate levels. An elevated Lactate:Pyruvate ratio may indicate inherited disorders of the respiratory chain complex, tricarboxylic acide cycle disorders and pyruvate carboxylase deficiency. Respiratory chain defects usually result in Lactate:Pyruvate ratios >20. A low Lactate:Pyruvate raio (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.
Limitations
This test was developed and its performance characteristics determined by LabCorp. It has not been cleared or approved by the Food and Drug Administration.
Methodology
Enzyme/UV
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