Blood tests to diagnose diabetes are fasting plasma glucose (FPG), oral glucose tolerance test (OGTT), random plasma glucose test.
Blood tests are done to diagnose diabetes. The following tests are done for diagnosis:
Fasting plasma glucose (FPG): This test measures blood glucose level in the morning (after 8 hours of fasting) before you eat or drink anything even tea or coffee. The test can help to diagnose diabetes and pre-diabetes.
Diagnosis based on fasting plasma glucose
Oral glucose tolerance test (OGTT): In this test the blood glucose level is measured in a person after drinking 75 grams of glucose solution. The test is done after at least 8 to 12 hours of fasting. The test can help to diagnose diabetes and pre-diabetes. OGTT is more sensitive as compared to FPG test for diagnosis of pre-diabetes, but it is more cumbersome as compared to FPG.
Based on the results of glucose tolerance test the following diagnoses may be made:
Random plasma glucose test: The test measures blood glucose at any time of the day disregarding to when the person last ate. This test is usually done to diagnose diabetes but not pre-diabetes.
If your blood sugar or blood glucose levels are elevated your doctor will recommend repeat testing on a different day to confirm the results.
Dr Poonam Sachdeva, our in-house medical expert talks about the why what and how in diabetes.
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