Serum/plasma concentration of glucose (24-hour profile)

Why This Test Is Done

Your healthcare provider may order this test to assess how your body handles glucose, especially if you have diabetes, prediabetes, or symptoms like frequent urination, excessive thirst, or unexplained weight changes. It can also help evaluate conditions like hypoglycemia (low blood sugar) or insulin resistance.

How the Test Works

A blood sample is collected (usually from a vein in your arm) and analyzed to measure glucose levels at multiple time points over 24 hours. The results help track patterns in your blood sugar, such as peaks and troughs, which can guide treatment plans.

Sample Collection and Preparation

You’ll likely be asked to fast for a portion of the day before the test, depending on the protocol. Blood samples may be drawn at different times, sometimes with or without fasting. Store your sample as instructed (e.g., refrigerated) until it reaches the lab.

What to Expect During the Test

The process is similar to a regular blood draw. You may feel slight discomfort, but it usually lasts a few minutes. If you’re taking insulin or oral diabetes medications, discuss this with your provider before the test to avoid fluctuations in your blood sugar.