: Lactate, Plasma or Serum, Substance Concentration Measurement

: What Is Lactate?

: Lactate is a chemical produced when your cells break down glucose (sugar) for energy, especially when oxygen is in short supply. Muscles make extra lactate during hard exercise, and the liver normally clears it from the blood. When lactate builds up beyond what the body can clear, it can be a sign of a health problem that needs medical attention.

: Why the Test Is Done

: Doctors order a lactate test to check for conditions where tissues may not be getting enough oxygen, such as severe infections, shock, or problems with blood flow. It is often used in emergency and hospital settings to help judge how sick a patient is and to monitor response to treatment. It may also be checked during or after intense exercise or when a metabolic disorder is suspected.

: How the Sample Is Collected

: A small amount of blood is drawn, usually from a vein in your arm, into a tube and sent to the laboratory. In urgent situations the sample may be taken from an artery or another site and tested quickly. Your care team may ask you to rest before the draw, because recent exercise can affect the result.

: What the Results Can Mean

: A lactate level within the expected range generally suggests your tissues are getting enough oxygen. A higher-than-expected level may point to stress on the body, poor oxygen delivery, or other conditions, and results are always interpreted alongside your symptoms and other tests. Your doctor will explain what your specific result means for you; do not try to interpret a single number on your own.