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Test Code LACS1 Lactate, Plasma

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Method Name


Reporting Name

Lactate, P

Advisory Information

This test does not measure D-lactate, an uncommon, often undiagnosed cause of lactic acidosis. See DLAC / D-Lactate, Plasma.

Necessary Information

Patient's age and sex are required.

Specimen Required

Container/Tube: Grey top (potassium oxalate/sodium fluoride)

Specimen Volume: 0.5 mL

Collection Instructions:

1. Collection must be at least 1 mL in a 2-mL draw tube or at least 2 mL in a 4-mL draw tube.

 2. Spin down and separate plasma from cells.

Specimen Type

Plasma NaFl-KOx

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma NaFl-KOx Refrigerated (preferred) 14 days
  Ambient  8 hours

Reject Due To

Gross hemolysis Reject

Reference Values

0-90 days (<3 months): ≤3.3 mmol/L

3-24 months: ≤3.1 mmol/L

>24 months-18 years: ≤2.2 mmol/L

>18 years: 0.5-2.2 mmol/L

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
LACS1 Lactate, P 2524-7


Result ID Test Result Name Result LOINC Value
LACS1 Lactate, P 2524-7

Useful For

Diagnosing and monitoring patients with lactic acidosis


While no definitive concentration of lactate has been established for the diagnosis of lactic acidosis, lactate concentrations exceeding 5 mmol/L and pH below 7.25 are generally considered indicative of significant lactic acidosis.