Serum or Plasma Lactate Concentration (Quantitative Measurement)

Why It’s Done

Your healthcare provider may order this test if you have symptoms like rapid breathing, confusion, or fatigue—common in conditions where your body isn’t getting enough oxygen (e.g., heart problems, severe infections, or low blood sugar). It’s also used during surgery, physical stress tests, or monitoring critical illnesses like sepsis.

What to Expect

A small blood sample is taken from your arm. You may feel a slight pinch, but it’s quick. The sample is sent to a lab where it’s analyzed for lactate levels. No special preparation is needed, but tell your provider about any medications or recent illnesses.

What the Results Mean

Higher-than-normal lactate levels may indicate poor oxygen use, such as in heart failure, severe infections, or dehydration. Lower-than-normal levels might suggest overuse of oxygen (e.g., in some metabolic disorders). Your provider will interpret results in the context of your health and symptoms.

Common Conditions Monitored

This test is often used to evaluate conditions like heart disease, stroke, severe infections (e.g., sepsis), or during surgery to monitor critical care needs. It can also help diagnose or manage metabolic disorders or exercise-related issues.