Fasting plasma glucose of 126 mg/dL or greater.
Plasma glucose of 200 mg/dL or greater at 2 hours following a 75-gram glucose load.
At least one of the above criteria must be met on more than one occasion. A typical blood glucose test involves drawing blood after a 12 hour fast, then drinking 75 grams of glucose, waiting 2 hours and drawing blood once again. Lab paperwork may refer to the blood test after the glucose drink as postprandial.
The glucose drink may be any one of a number of name brands. It typically comes in a 12 oz bottle and contains 75 g of glucose. The 75 grams is the World Health Organization (WHO) recommended adult dose for glucose tolerance tests. It is usually flavored and carbonated. Typical ingredients include a dextrin (sugar) syrup, water, acidity control chemical, preservatives, food coloring, and carbonic acid.
Symptoms of diabetes, according to the American Diabetes Association, are as follows;
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