Prediabetes or Categories of Increased Risk for Diabetes
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- Isolated impaired fasting glucose (IFG) and isolated impaired glucose tolerance (IGT) are intermediate states of abnormal glucose homeostasis between normal and overt diabetes.
- Prediabetes is an unofficial designation including either IFG, IGT or both.
- Documentation of IFG requires only a fasting plasma glucose. Documentation of IGT requires a 75-gm oral glucose tolerance test.
- A hemoglobin A1c of 5.7 - 6.4% identifies individuals in "categories of high risk for diabetes" to whom the term "prediabetes" may be applied (ADA Standards of Medical Care in Diabetes).
- See Table Table 1 for exact definitions.
2 hour Glucose (mg/dl) during a
Isolated Impaired Fasting Glucose*
Isolated Impaired Glucose Tolerance
Combined IFG and IGT
Prediabetes or Categories of Increased Risk**
5.7 - 6.4
* The WHO and IDF recommend that Impaired Fasting Glucose be 110-125 mg/dl
**At least one criteria needs to be satisfied for diagnosis