A normal lactic acid dehydrogenase level ranges from 140 to 280 units per liter, according to WebMD. The different testing procedures used in laboratories account for variances in LDH measurements. High LDH levels indicate possible cell damage and the presence of an acute or chronic disease.
A reading that displays low LDH levels rarely occurs and represents no threat to the body, according to Healthline. Physicians typically measure LDH levels by blood drawn from a vein, but urine and spinal fluid also have diagnostic properties. Factors that raise LDH and adversely effect testing include the consumption of aspirin, certain antibiotics and alcohol as well as taking part in vigorous exercise before testing.