Glucose in Serum or Plasma (Mass Concentration)

Why Is This Test Done?

Your healthcare provider may order this test to check your blood sugar levels. Common reasons include diagnosing or managing diabetes, assessing risk for conditions like high blood sugar, or evaluating metabolic health. It’s often part of routine check-ups or before certain treatments.

What to Expect Before the Test

For this test, you’ll typically provide a blood sample from a vein in your arm. If fasting is required (e.g., for certain glucose tests), you’ll need to avoid eating or drinking (except water) for a set period before the draw. No special preparation is needed for routine glucose testing unless specified by your provider.

What the Results Mean

Glucose results are usually reported in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). While reference ranges vary by lab, high or low levels may signal diabetes, hypoglycemia, or other metabolic issues. Your provider will interpret results in the context of your overall health.

Common Conditions Monitored

This test is critical for diagnosing and monitoring diabetes (both type 1 and type 2), prediabetes, and conditions like gestational diabetes. It can also help track how well treatments like medications or lifestyle changes are working.