Lactic acid test

Lactic acid is mainly produced in muscle cells and red blood cells. It forms when the body breaks down carbohydrates to use for energy during times of low oxygen levels. Times when your body's oxygen level might drop include:

  • During intense exercise
  • When you have an infection or disease

A test can be done to measure the amount of lactic acid in the blood.

How is the Test Performed?

A blood sample is needed. Most of the time blood is drawn from a vein located on the inside of the elbow or the back of the hand.

Preparation for the Test

Do not exercise for several hours before the test. Exercise can cause a temporary increase in lactic acid levels.

How will the Test Feel?

You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn.

Why is the Test Performed?

This test is usually done to diagnose lactic acidosis.

Normal Results for Lactic acid test

4.5 to 19.8 mg/dL (0.5-2.2 mmol/L)

Note: mg/dL = milligrams per deciliter; mmol/L = millimoles per liter

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

What Abnormal Results Mean

Abnormal results mean that body tissues are not getting enough oxygen.

Conditions that can increase lactic acid levels include:

  • Heart failure
  • Liver disease
  • Lung disease
  • Not enough blood containing oxygen getting to a certain area of the body
  • Severe infection that affects the entire body (sepsis)
  • Very low levels of oxygen in the blood (hypoxia)

Considerations

Clenching the fist or having the elastic band in place for a long time while having blood drawn can result in a false increase in lactic acid level.

References

Seifter JL. Acid-base disorders. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 120.

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Review Date: 5/5/2013
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.
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