Diabetes Tests
Diabetes tests measure blood glucose levels to screen for, diagnose, and monitor conditions like type 1, type 2, and gestational diabetes.
What are diabetes tests?
Diabetes mellitus is a disease that affects how your body uses glucose (blood sugar), your body's main source of energy. A hormone called insulin helps move glucose from your bloodstream into your cells. If you have diabetes, your body cannot make or use insulin effectively, causing glucose levels to become too high, which can lead to serious health conditions like heart disease, nerve damage, and kidney disease.
What are they used for?
Diabetes tests are used to screen, monitor, or diagnose:
- Type 1 diabetes: The body makes little or no insulin because the immune system destroys insulin-producing cells.
- Type 2 diabetes: The body's cells do not respond well to insulin; often linked to genetics and lifestyle factors.
- Gestational diabetes: A form of diabetes that develops during pregnancy.
- Prediabetes: Glucose levels are higher than healthy levels but not high enough to be considered diabetes.
Why do I need a diabetes test?
You may need testing if you have symptoms such as increased thirst, frequent urination, fatigue, blurred vision, or slow-healing sores. The American Diabetes Association recommends screening for prediabetes and diabetes beginning at age 35. You may also need testing if you have risk factors such as being overweight, having a family history of diabetes, high blood pressure, or having previously had gestational diabetes.
What happens during a diabetes test?
Most tests involve measuring blood glucose levels. Common tests include:
- Blood glucose test (fasting blood glucose): Requires fasting for eight hours; often used for screening.
- Oral glucose tolerance test (OGTT): Requires fasting; involves drinking a glucose liquid and having blood drawn two hours later to see how your body processes sugar.
- Glucose challenge test: Used for gestational diabetes; involves drinking a glucose liquid and having blood drawn one hour later. No fasting required.
- Random blood sugar: Can be taken at any time; used if you have symptoms.
- Hemoglobin A1c (HbA1c): Measures average glucose levels over the past three months. No fasting required.
Glucose may also be measured in urine, though this is less accurate than blood tests and is generally used only to indicate if further blood testing is needed.
What do the results mean?
Results may indicate healthy glucose levels, prediabetes, or diabetes. If diagnosed with type 1 diabetes, the condition is managed with insulin and monitoring. If diagnosed with type 2 diabetes or prediabetes, management may include lifestyle changes like diet and exercise, and medication. Gestational diabetes is often managed through diet and exercise and typically resolves after birth, though it increases the risk of developing type 2 diabetes later.