Lactate (Serum or Plasma) Concentration

Why It’s Done

Your doctor may order this test if you have symptoms like rapid breathing, confusion, or fatigue, which can indicate conditions like heart problems, kidney issues, or infections. It’s also used in monitoring patients with severe illness, shock, or during surgery to track how well their body is responding to oxygen and energy needs.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if it’s part of a broader metabolic evaluation. Bring any medications you’re taking to your appointment.

During the Test

A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. The blood sample is then sent to a lab for analysis.

What the Results Mean

Lactate levels can vary based on your health, activity level, and other factors. High levels may suggest conditions like low blood oxygen, heart or kidney problems, or infections. Low levels might indicate normal metabolic function or certain medical conditions that need further evaluation.