1 Hour Glucose Tolerance Test/葡萄糖因子檢測
appointment time: Tue. 10/9 7:30 a.m.
fast for 12 hours, water only
6916 METROPOLITAN AVE
MIDDLE VILLAGE, NY 11379
Phone: 718-416-1790
Fax: 718-416-1810
Hours: MONDAY-FRIDAY 7:30A-4:00P
CLOSEDLUNCH 11:30A-12:00P
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How is the screening test done?
When you arrive for the test, you'll be given a sugar solution that contains 50 grams of glucose. The stuff tastes like a very sweet soda pop (it comes in cola, orange, or lime flavor), and you have to get all of it down in five minutes. Some centers keep it chilled or let you pour it over ice and drink it cold.
An hour later (bring a book or magazine!), your practitioner or a technician will take a blood sample from your arm to check your blood sugar level. The idea is to see how efficiently your body processes sugar. Results should be available in a few days.
If the reading is abnormal (too high), which happens 15 to 23 percent of the time, your practitioner will have you come back for a three-hour glucose tolerance test to see if you really do have gestational diabetes. The good news is that most women whose screening test shows elevated blood sugar don't turn out to have gestational diabetes.
What is the glucose tolerance test like?
For eight to 14 hours before the test, you can't eat or drink anything but sips of water (and you're not supposed to smoke or exercise either), so you'll want to schedule it for first thing in the morning.
When you arrive for the test, the technician will take a blood sample to measure your "fasting blood glucose level" and then ask you to drink either a more concentrated dose or a larger volume of the glucose solution. Then brace yourself for three more arm pricks, as your blood is tested every hour for the next three hours. The technician should alternate arms each time she draws your blood.
You'll definitely need something to distract you this time, because you'll have to stay seated in the waiting room between blood drawings. And bring something to eat right after your final blood sample is drawn because you'll probably be starving.
If one of the readings is abnormal, you may have to take another test later in your pregnancy. Or your practitioner may ask you to make some changes in your diet and exercise routine. If two or more of your readings are abnormal, you'll be diagnosed with gestational diabetes and you'll need to talk to your practitioner about a treatment plan. This chart shows the levels that the American Diabetes Association considers abnormal at each interval of the test:
| Gestational Diabetes Screening: Glucose Challenge Test (1 hour after a 50-gram glucose drink) | |
| Less than 140* mg/dL (7.8 mmol/L) | Normal glucose tolerance |
| 140* mg/dL (7.8 mmol/L) and over | Abnormal, needs OGTT (see below) |
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