What is a glucose tolerance test?
A glucose tolerance test checks how well your body handles sugar. It’s usually used to diagnose diabetes or gestational diabetes (diabetes during pregnancy). The test involves drinking a sugary drink and then having your blood sugar levels checked over time.
Who is a candidate for a glucose tolerance test?
You may need this test if you:
- Have symptoms of diabetes, like increased thirst or frequent urination
- Had a high result on a routine blood sugar test
- Are pregnant and being screened for gestational diabetes
- Have risk factors for diabetes, like being overweight or having a family history
What to expect during a glucose tolerance test
You’ll be asked to fast (not eat or drink anything but water) for 8–12 hours before the test. First, a blood sample is taken to check your fasting blood sugar. Then, you’ll drink a sweet liquid containing glucose. After that, your blood will be drawn several more times over the next 1 to 3 hours to see how your body processes the sugar.
What are the risks for a glucose tolerance test?
The risks are very low. You may feel dizzy, nauseated, or lightheaded after drinking the glucose drink. Blood draws might cause minor bruising or soreness.
What does recovery from a glucose tolerance test entail?
There’s no special recovery needed. You can go back to normal activities once the test is finished. Your doctor will review your results and talk to you about any next steps.