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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