What is the normal range for a 1 hour glucose test?
Christopher Martinez
Published Apr 21, 2026
What is the normal range for a 1 hour glucose test?
A normal fasting blood glucose level is lower than 95 mg/dL (5.3 mmol/L). One hour after drinking the glucose solution, a normal blood glucose level is lower than 180 mg/dL (10 mmol/L). Two hours after drinking the glucose solution, a normal blood glucose level is lower than 155 mg/dL (8.6 mmol/L).
How long does it take to hear back about glucose test results?
Results: These should be available in a few days. If the reading is too high, which happens an estimated 15 to 23 percent of the time, you’ll be asked to return for a three-hour glucose tolerance test (see below) to see whether you have gestational diabetes.
What does a 1 or 2 hour oral glucose tolerance test tell the physician?
The OGTT is a very important method of screening for diabetes. It measures how the body is able to store glucose by removing it from the blood. For both sexes, the test measures the plasma response to an intake of 75 g of concentrated glucose solution, usually at 1 and 2 hours.
What is 1 hour glucose test for pregnancy?
The glucose challenge test, also called the one-hour glucose tolerance test, measures your body’s response to sugar (glucose). The glucose challenge test is done during pregnancy to screen for gestational diabetes — diabetes that develops during pregnancy.
How does 1 hour glucose test work?
What is the Glucose Challenge Screening Test? No preparation is required prior to the test. During the test, the mother is asked to drink a sweet liquid (glucose) and then will have blood drawn one hour from having the drink, as blood glucose levels normally peak within one hour.
Is it better to fast before 1 hour glucose test?
You do not need to prepare or change your diet in any way. You will be asked to drink a liquid that contains glucose. Your blood will be drawn 1 hour after you drink the glucose solution to check your blood glucose level.
Can you eat before 1 hour glucose test?
Do not eat, drink, smoke, or exercise strenuously for at least 8 hours before your first blood sample is taken. Tell your doctor about all prescription and nonprescription medicines you are taking. You may be instructed to stop taking certain medicines before the test.
What were your 3 hour glucose test results?
3-Hour Glucose Test
| Interval | Abnormal reading |
|---|---|
| Fasting | 95 mg/dl or higher |
| One hour | 180 mg/dl or higher |
| Two hours | 155 mg/dl or higher |
| Three hours | 140 mg/dl or higher |
How do you read a 2 hour glucose tolerance test?
Normal Results 2 hours — This value is used to make the diagnosis of diabetes. Less than 140 mg/dL (7.8 mmol/L). Between 141mg/dL and 200 mg/dL (7.8 to 11.1 mmol/L) is considered impaired glucose tolerance. Above 200 mg/dl (11.1mmol/L) is diagnostic of diabetes.
What is the 1-hour glucose challenge Test (GCT)?
Updated on November 4, 2019. The 1-hour glucose challenge test or GCT, measures the effect of a glucose solution on blood glucose levels. The GCT does not necessarily diagnose diabetes but it screens women who may be at risk and who may need a 3-hour glucose tolerance test or GTT. A blood sample is taken 1-hour after ingesting a glucose solution.
What is a diagnostic 3-hour glucose test (GTT)?
Women whose serum glucose is above the threshold value on the GCT (130-140 mg/dL) have a diagnostic 3-hour GTT done to find out if they have diabetes. The 3-hour GTT consists of drinking 100g of glucose and having four blood samples drawn: fasting, and then 1, 2, and 3 hours after the drink. Cutoff values for the 3-hour GTT are as follows:
What is the normal range for glucose tolerance test?
You’ll drink a liquid that contains glucose, and then 1 hour later your blood will be drawn to check your blood sugar level. A normal result is 140 mg/dL or lower. If your level is higher than 140 mg/dL, you’ll need to take a glucose tolerance test.
How to interpret the results of a blood test for diabetes?
According to the practice recommendations of the American Diabetes Association, the results of the blood test are interpreted as follows: If your blood glucose level is 70 to 99* mg/dL (3.9 to 5.5 mmol/L). . . If your blood glucose level is 100 to 125 mg/dL (5.6 to 6.9 mmol/L). . .
