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Test Code PYRC Pyruvate, Spinal Fluid

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Reporting Name

Pyruvic Acid, CSF

Specimen Type

CSF


Additional Testing Requirements


This test does not calculate the lactate:pyruvate ratio. To obtain this information, both this test and LASF1 / Lactic Acid, Spinal Fluid must be ordered. The ratio can be calculated from the results obtained from these tests.



Specimen Required


Specimen Type: Spinal fluid

Container/Tube: Sterile vial

Specimen Volume: 0.6 mL

Collection Instructions: Send specimen from vial 4.


Reject Due To

Gross hemolysis Reject

Specimen Stability Information

Specimen Type Temperature Time
CSF Refrigerated (preferred) 7 days
  Frozen  14 days
  Ambient  7 days

Specimen Minimum Volume

0.5 mL

Day(s) Performed

Monday, Thursday

Specimen Retention Time

2 months

Report Available

2 to 5 days

Reference Values

0.06-0.19 mmol/L

Useful For

Investigating possible disorders of mitochondrial metabolism, when used in conjunction with cerebrospinal fluid lactate, collected at the same time, to determine the lactate-to-pyruvate (L:P) ratio

 

Evaluating patients with neurologic dysfunction and normal blood L:P ratios

CPT Code Information

84210

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PYRC Pyruvic Acid, CSF 14122-6

 

Result ID Test Result Name Result LOINC Value
83356 Pyruvic Acid, CSF 14122-6

Method Description

Pyruvate, in the presence of excess nicotinamide adenine dinucleotide, hydrogen ions, and lactic dehydrogenase, is reduced to lactate. The reaction is stoichiometric; the decrease in absorbance at 340 nm is directly proportional to the concentration of pyruvate.(Huckabee WE. Relationships of pyruvate and lactate during anaerobic metabolism. I. Effects of infusion of pyruvate or glucose and of hyperventilation. J Clin Invest. 1958;37[2]:244-254; Benoist JF, Alberti C, Leclercq S, et al. Cerebrospinal fluid lactate and pyruvate concentrations and their ratio in children: age-related reference intervals. Clin Chem. 2003;49[3]:487-494; Cowan T, Pasquali M. Laboratory investigations of inborn errors of metabolism. In: Sarafoglou K, Hoffman GF, Roth KS, eds. Pediatric Endocrinology and Inborn Errors of Metabolism. 2nd ed. McGraw-Hill; 2017:1139-1158)

Genetics Test Information

The cerebrospinal fluid lactate:pyruvate (L:P) 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 L:P ratios. Pyruvic acid levels alone have little clinical utility.