Glucose in Serum (Glucose Level)

Why Is This Test Done?

Doctors may order a serum glucose test to diagnose or monitor conditions like diabetes, check for high or low blood sugar, evaluate how your body responds to medications, or assess metabolic disorders. It can also be part of routine health check-ups or before certain treatments.

What to Expect Before the Test

For this test, you’ll typically have a small needle inserted into your arm to draw blood. No special preparation is usually needed, but fasting (not eating or drinking) for 8–12 hours before the test may be required if checking for diabetes or insulin resistance.

What Happens During the Test?

Blood is collected from a vein in your arm using a needle. The sample is then sent to a lab for analysis. The process usually takes a few minutes, and you may feel a slight pinch or discomfort, but it’s generally quick and painless.

What Are the Possible Results?

Results are expressed in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L). High or low values may indicate conditions like diabetes, hypoglycemia, or other metabolic issues that need further evaluation by a healthcare provider.