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HelpTest Code LAPYP Lactate Pyruvate Panel, Plasma
Ordering Guidance
This test does not measure D-lactate, an uncommon, often undiagnosed cause of lactic acidosis. If D-lactate testing is needed, order DLAU / D-Lactate, Urine (preferred) or DLAC / D-Lactate, Plasma.
Analytes from this test are included in test MMPP / Mitochondrial Metabolites, Plasma. If ordered together, this test may be canceled.
Specimen Required
Collection Container/Tube:
Preferred: Green top (Sodium heparin)
Acceptable: Green top (Lithium heparin)
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot plasma into a plastic vial.
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Useful For
Diagnosing and monitoring patients with lactic acidosis
Monitoring lactate-to-pyruvate ratios
Method Name
Gas Chromatography Mass Spectrometry (GC-MS)
Reporting Name
Lactate Pyruvate Panel, PSpecimen Type
PlasmaSpecimen Minimum Volume
0.1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Plasma | Frozen (preferred) | 90 days | |
| Ambient | 7 days | ||
| Refrigerated | 7 days |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | OK |
Reference Values
Lactic Acid
≤ 4000.0 nmol/mL
Pyruvic Acid
≤ 350.0 nmol/mL
Interpretation
An elevated lactate-to-pyruvate (L:P) ratio may indicate inherited disorders of the respiratory chain complex, tricarboxylic acid cycle disorders, and pyruvate carboxylase deficiency. Respiratory chain defects usually result in L:P ratios above 20.
A low L:P ratio (disproportionately elevated pyruvic acid) may indicate an inherited disorder of pyruvate metabolism. Defects of the pyruvate dehydrogenase complex result in L:P ratios below 10.
The L:P ratio is characteristically normal in other patients. An artifactually high ratio can be found if the patient is acutely ill.
Cerebrospinal fluid (CSF) L:P ratio may assist in evaluation of patients with neurologic dysfunction and normal blood L:P ratios. Blood and CSF specimens should be collected at the same time.
Day(s) Performed
Wednesday
Report Available
3 to 9 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
83605
84210
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| LAPYP | Lactate Pyruvate Panel, P | 101656-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 616797 | Interpretation | 59462-2 |
| 616794 | Lactic acid | 2524-7 |
| 616795 | Pyruvic acid | 32338-6 |
| 616796 | Reviewed by | 18771-6 |