The diagnosis of diabetes based on clinical signs and symptoms can be difficult. If you have symptoms suggestive of diabetes, your doctor will recommend blood sugar level testing to confirm the diagnosis.
The tests which may be done to diagnose diabetes are:
The level of blood glucose level is measured in the morning (after 8 hours of fasting) before you eat or drink anything during this test. The test can help to diagnose diabetes and pre-diabetes. Diagnoses based on fasting plasma glucose are as follows:
This test determines your blood glucose level after drinking 75 grams of glucose solution. Your doctor will recommend that you fast for at least 8 to 12 hours before doing this test. 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.
Diagnoses based on OGTT are as follows:
This test measures your blood glucose at any time of the day irrespective of the time when you had your last meal or food. This test is usually done to diagnose diabetes but not pre-diabetes. If the random blood glucose level is > 200 mg/dL and you have symptoms of diabetes (such as increased urination, increased thirst and unexplained weight loss), it indicates that you may have diabetes. Your doctor may recommend FPG or OGTT to confirm the diagnosis.
If your blood sugar or blood glucose levels are elevated (FPG, OGTT, or RBS), your doctor will recommend repeat testing on a different day to confirm the results. According to experts, the criteria for diagnosing diabetes are satisfied if any of the following results are obtained on at least two different days:
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