What is a normal lactic acid level?

A normal lactic acid level typically ranges from 0.5 to 2.2 millimoles per liter (mmol/L) or 4.5 to 19.8 milligrams per deciliter (mg/dL). However, the normal range may vary slightly depending on the laboratory conducting the test. It's important to note that lactic acid levels can transiently rise during intense exercise or strenuous activity, but they usually return to normal once the activity stops. If the lactic acid level exceeds the normal range persistently, it may indicate an underlying medical condition that requires further investigation.