The new Reference range for glucose
Blood Glucose Reference Ranges
Fasting Blood Glucose
From 70 to 99 mg/dL Normal glucose tolerance
From 100 to 125 mg/dL Impaired fasting glucose (pre-diabetes)
126 mg/dL or more in more than one occasion Diabetes
Oral Glucose Tolerance Test (OGTT)
[except pregnancy]
(2 hours after a 75-gram glucose drink)
Less than 140 mg/dL Normal glucose tolerance
From 140 to 200 mg/dL Impaired glucose tolerance (pre-diabetes)
Over 200 mg/dL on more than one testing occasion Diabetes
Gestational Diabetes Screening: Glucose Challenge Test
(1 hour after a 50-gram glucose drink)
Less than 140* mg/dL Normal glucose tolerance
140* mg/dL and over Abnormal, needs OGTT (see below)
* Some use a cutoff of >130 mg/dL because that identifies 90% of women with gestational diabetes, compared to 80% identified using the threshold of >140 mg/dL
Gestational Diabetes Diagnostic: OGTT
(100-gram glucose drink)
Fasting* 95 mg/dL
1 hour after glucose load* 180 mg/dL
2 hours after glucose load* 155 mg/dL
3 hours after glucose load* 140 mg/dL
* If two or more values are above the criteria, gestational diabetes is diagnosed.
** A 75-gram glucose load may be used, although this method is not as well validated as the 100-gram OGTT; the 3-hour sample is not drawn if 75 grams is used.