Glucose in Serum or Plasma (24-hour Profile)

Why This Test Is Done

Your doctor may recommend this test if you have symptoms like extreme hunger, fatigue, frequent urination, or unexplained weight changes. It’s also used to check how well medications for diabetes are working or to diagnose conditions like hypoglycemia (low blood sugar) or hyperglycemia (high blood sugar).

What to Expect Before the Test

You’ll provide a blood sample (serum or plasma) collected at regular intervals over 24 hours. Typically, you’ll have a small tube inserted in your arm, and samples are taken at set times (e.g., before meals, 1–2 hours after meals, and at bedtime). Follow your doctor’s instructions carefully about diet and activity during this period.

What the Results Mean

The test provides a detailed picture of your blood sugar levels at different times. Abnormal results may indicate poor blood sugar control, which could affect your energy, health, or how certain medications work. Your doctor will interpret the results in relation to your symptoms and medical history.

Common Conditions This Test Helps Diagnose

This test can help diagnose or monitor conditions like type 1 or type 2 diabetes, prediabetes, reactive hypoglycemia (low blood sugar after eating), or insulin resistance. It may also be used to evaluate how well you’re managing blood sugar with lifestyle changes or medications.