How Do Doctors Diagnose Diabetes?


Quick Answer

Doctors diagnose diabetes using a fasting blood glucose test or a random blood glucose test, according to MedicineNet. In a fasting test, the physician has a patient fast overnight and take a blood test to detect glucose. Results over 126 on two or more fasting tests indicate that the patient has diabetes. In a random test, a result of 200 or higher indicates diabetes.

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How Do Doctors Diagnose Diabetes?
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Full Answer

Doctors also sometimes use an oral glucose tolerance test to detect diabetes, reports Mayo Clinic. Patients fast overnight, take a fasting blood glucose test and drink a sugary liquid. Over the next two hours, health professionals periodically test glucose levels. A result of over 200 after two hours indicates diabetes.

Another test for diabetes is the glycated hemoglobin, or A1C, test, states Mayo Clinic. This test indicates average blood sugar over the last few months by measuring the percentage of glucose attached to hemoglobin in the blood. Doctors diagnose a patient with diabetes once the patient has a result of 6.5 or over on two different tests.

Patients who have a body mass index of 25 or higher and a sedentary lifestyle, a history of diabetes during pregnancy or high blood pressure should receive diabetes screening tests, reports Mayo Clinic. Anyone over age 45 should also receive screening for diabetes.

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