Serum or plasma lactate concentration

Why Is This Test Done?

Doctors may order a lactate test to evaluate conditions affecting how your body uses oxygen and energy. This can include diagnosing or monitoring severe infections, heart or lung problems, low blood pressure (septic shock), or metabolic disorders. It’s also used during surgeries or critical care to track how well your body is responding to treatment.

When Might You Need This Test?

You might need this test if you have symptoms like rapid breathing, confusion, low blood pressure, or signs of severe illness. It’s often done in hospital settings for patients in critical condition, such as after surgery, during heart attacks, or in cases of shock.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a short time before the blood draw, but this depends on your doctor’s instructions. The test involves a small needle inserted into your arm to collect blood, which is then sent to a lab for analysis.

What Happens During the Test?

A healthcare professional will clean the area of your arm and insert a small needle to draw blood. You may feel a brief pinch, but the procedure is quick. The blood sample is then processed to measure lactate levels.