Prediabetes can be confirmed by your healthcare provider through a blood test. The tests include fasting blood sugar test, oral glucose tolerance test and A1c test.
Fasting blood sugar test is a blood sample that is taken after you fast for at least eight hours or overnight. A fasting blood sugar level from 100 to 125 mg/dL (5.6 to 7.0 mmol/L) is considered prediabetes. This result is sometimes called impaired fasting glucose.
Oral glucose tolerance test is usually used to diagnose diabetes only during pregnancy. A blood sample is taken after you fast for at least eight hours or overnight. Then you’ll drink a sugary solution, and your blood sugar level will be measured again after two hours. If the blood sugar level is from 140 to 199 mg/dL (7.8 to 11.0 mmol/L), then it is considered prediabetes. This is sometimes referred to as impaired glucose tolerance.
A1c test, also known as the haemoglobin A1C or HbA1c test, is a simple blood test that provides the average blood glucose level over the past three months. Prediabetes is confirmed if the value of A1c test is 5.7% to 6.4% mg/dL. The normal value is < 5.7%, and for diabetes the range is 6.5% or higher.
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