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. Your body's oxygen level might drop during intense
exercise or if you have an infection or disease. A test can be
done to measure the amount of lactic acid in the blood. How the
Test is Performed A blood sample is needed. for information on
how this is done, see: Venipuncture. How to Prepare for the Test
Do not exercise for several hours before the test. Exercise can
cause a temporary increase in lactic acid levels. How the Test
Will Feel When the needle is inserted to draw blood, some people
feel moderate pain, while others feel only a prick or stinging
sensation. Afterward, there may be some throbbing. Why the Test
is Performed This test is usually done to diagnose lactic
acidosis. 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 a