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1. Fasting plasma glucose (FPG) test. This test measures your blood sugar levels after an overnight fast (not eating for at least 8 hours). The results are typically given in milligrams...
Key points. You’ll need a blood sugar test to find out if you have prediabetes or diabetes. Testing is simple, and results are usually available quickly. Why get tested. Prediabetes and type 2 diabetes often don't have any symptoms. (Type 1 diabetes is different—symptoms can develop quickly and can be severe.)
Tests for type 1 and type 2 diabetes and prediabetes. A1C test. This blood test, which doesn't require not eating for a period of time (fasting), shows your average blood sugar level for the past 2 to 3 months. It measures the percentage of blood sugar attached to hemoglobin, the oxygen-carrying protein in red blood cells.
Learn about the diabetes diagnosis criteria and various tests used like A1C, Fasting Plasma Glucose (FPG), Oral Glucose Tolerance Test (OGTT), and Random Plasma Glucose Test.
Your doctor can diagnose diabetes, prediabetes, and gestational diabetes using blood tests. The blood tests show if your blood glucose level, also called blood sugar, is higher than the range that is healthy for you. Blood tests can also help identify the type of diabetes you have.
There are many tests that confirm a diabetes diagnosis, including a fasting plasma glucose test, oral glucose tolerance test, random plasma glucose test, and hemoglobin A1c test.
Blood sugar testing gives useful information to manage diabetes. It can help you: Track the effect of diabetes medicine on blood sugar levels. Adjust doses of diabetes medicines with the guidance of your treatment team. Find out if blood sugar levels are high or low.