MetabolicCritical Care

Lactate

Normal Range
0.5 - 2.2 mmol/L
Sample Type
Plasma (Sodium Fluoride)
Fasting
No
Unit
mmol/L

Function

Lactate (lactic acid) is a byproduct of anaerobic metabolism, produced when cells do not receive enough oxygen to perform aerobic respiration. Under normal conditions, lactate is cleared by the liver and kidneys. When production exceeds clearance, lactic acidosis occurs, serving as a critical biomarker for tissue hypoxia.

Why it is Ordered

Lactate is one of the most important tests in emergency and intensive care settings. It is used for:

  • Sepsis Screening: A core component of the Sepsis-3 bundle to identify patients at high risk of septic shock.
  • Shock Management: Monitoring the adequacy of fluid resuscitation in cardiogenic, hypovolemic, or distributive shock.
  • Ischemia Detection: Assessing for mesenteric ischemia (bowel infarction) or limb ischemia.
  • Metabolic Evaluation: Investigating unexplained metabolic acidosis.

Associated Conditions

  • Type A Lactic Acidosis: Caused by tissue hypoperfusion (Sepsis, MI, severe hemorrhage, heart failure).
  • Type B Lactic Acidosis: Caused by cellular dysfunction or toxins rather than hypoxia (Malignancy, Liver failure, Metformin toxicity, Cyanide poisoning).
  • Diabetic Ketoacidosis (DKA): Lactate may be elevated alongside ketones.
  • Strenuous Exercise: Temporary, physiological elevation due to muscle exertion.

Check Your Result

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mmol/L

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Why Context Matters

Lactate levels are extremely sensitive to collection techniques. A prolonged tourniquet application (venous stasis) or the patient clenching their fist during the draw can cause a localized, false elevation in lactate. Furthermore, the sample must be processed immediately on ice or collected in a gray-top (sodium fluoride) tube to stop glycolysis; otherwise, red blood cells will continue to produce lactate in the tube, artificially raising the result. Stress, agitation, and certain medications like Albuterol can also cause mild elevations unrelated to tissue hypoxia.

Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.

Clinical References

Source-of-truth databases and clinical guidelines for Lactate:

Research & Guidelines

Related Indicators

Lipid Profile

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Urine Bicarbonate

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Albumin

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DR

Medically Reviewed by Dr. Binoy Babu, MBBS

Board Certified Doctor • 10+ Years Clinical Experience

Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.

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