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Fasting blood glucose levels
Normal fasting blood sugar for person without diabetes
A normal fasting blood glucose for someone who does not have diabetes ranges from 70 to 99 mg/dl. A fasting blood glucose of 126 mg/dl or greater is called diabetes. The range between of 100 to 125 mg is called prediabetes
Glucose Tolerance Test
One of the screening tests for diabetes is called an oral glucose tolerance test, or OGTT. (A slightly different version of the OGTT is also used to diagnose gestational diabetes, which is diabetes that develops during pregnancy).
For this test, the person needs to fast overnight and go to the doctor’s office or a lab in the morning. A blood sample will be used to measure the fasting blood sugar. The person then drinks a sugary drink that contains 75 grams of sugar. Two hours later, blood sugar is checked again. A normal blood sugar is lower than 140 mg/dl. A blood sugar between 140 and 199 mg/dl is considered to be prediabetes, and a blood sugar of 200 mg/dl or higher can indicate diabetes.
HbA1c
This blood test measures the percentage of glucose in the red blood cells( RBC) The red cell life span in the blood in a normal person in 3 months. This blood test the HbA1C,provides the average levels of blood glucose in the past 3 months
In addition to being a tool for diagnosing diabetes, the HbA1C test is used to help people who have diabetes manage their condition.
For someone who does not have diabetes, a normal HbA1C level is below 5.7%. An A1C between 5.7% to 6.4% is indicative of prediabetes and 6.5 % or over is diabetes
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