Glucose screening and glucose tolerance tests | BabyCenterMost health practitioners routinely recommend screening glucose test (also called a glucose challenge test or GCT) between 24 and 28 weeks of pregnancy to check.
Gestational diabetes is a condition in which high blood sugar that some women get during pregnancy. Between 2 and 5 percent of pregnant women develop this condition, making it one of the most. And because the condition rarely causes any symptoms, testing is the only way to know if you have it.
As a screening test, GCT will not provide a diagnosis. Instead, it is designed to identify women as possible who might have a problem and need more testing to find out. So a positive result does not mean that you have gestational diabetes.
In fact, only about a third of women who test positive on the glucose screen actually have the condition. If you test positive at screening, you will need to take a glucose tolerance test (GTT) -. More tests, more definitively tell you for sure whether you have gestational diabetes
Your practitioner may want to be screened earlier than 24 weeks, routine urine test showed a lot of sugar in your urine or if you're considering. If the results are normal, you will be screened again at 24 to 28 weeks.
Of course, if you are diagnosed with, you do not need to be screened. Instead, you will continue to work with your doctor to manage your condition during pregnancy.
When you arrive for the exam, you are given a sugar solution containing 50 grams of glucose. Things like soda pop tastes very sweet (it comes in cola, orange or lime flavor), and you have to get all of that down in five minutes. Some centers stay cool or let you pour it over ice and drink it cold.
An hour later (bring something to read!), Blood sample taken from your arm to check your blood sugar levels. The idea is to see how efficiently your body processes sugar. Results should be available within a few days.
If the reading is too high, which occurs 15-23 percent of the time, you will be asked to come back for a three-hour glucose tolerance test to see if you really have to gestational diabetes. The good news is that most women whose screening tests show high blood sugar does not turn out to have gestational diabetes.
Some mothers-to-be feel sick after drinking a glucose solution, and even throw some up. It may help to eat something few hours before the screening tests. If you throw up as soon as you get a drink down, you have to come back another day and repeat the test.
This is actually more common for women to feel pain during glucose three hours tolerance test, because the solution for tests that may be twice as sweet or twice as much fluid as a screening test, and you must drink after fasting.
Different practitioners use different standards for determining whether your level is too high. Some will say that if an hour of your blood sugar level is 140 milligrams of glucose per deciliter of blood plasma (mg / dL) or more, you should have a glucose tolerance test. Others put the cutoff at 130 mg / dL to capture more women who may have gestational diabetes, though there will likely be more false positives in this way.
If your blood glucose levels for this screening is higher than 200 mg / dL, most practitioners will consider you diabetic and you will not be required to take the glucose tolerance test. But the scores of each between 140 and 200 means that you have to take a three-hour glucose tolerance test for a definite diagnosis.
The exact procedure varies, but usually you are instructed to eat a late meal the night before the exam. After that you can be told not to eat or drink anything except sips of water, so you'll want to schedule the test for first thing in the morning.
When you arrive for the test, blood samples were taken to measure your fasting blood glucose levels. Then you better drink more concentrated dose or a larger volume of glucose solution. At that time, brace yourself for three stab arms, such as your blood tested every hour for the next three hours. Technicians should alternate your arms every time blood is taken.
You'll want to bring something to distract you, because you have to remain seated in the waiting room when your blood is not drawn. Also bring something to eat after the final blood sample was taken, because you may bestarving.
If one of the readings are not normal, 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 reading is abnormal, you will be diagnosed with gestational diabetes. Your practitioner will talk to you about a treatment plan
This chart shows that the level of the American Diabetes Association considers abnormal in each assay interval :.
You will work with your practitioner or a specialist diabetes and possibly a nutritionist to come up with.
Your high blood sugar should only last during your pregnancy. But some women who develop diabetes during pregnancy still have it after giving birth, so you will have to take a glucose test six to eight weeks after birth.
ACOG. 2011. opinion of the Committee 504: Screening and diagnosis of gestational diabetes. The American College of Obstetricians and Gynecologists.
ACOG. 2001 (reaffirmed in 2010). Practice Bulletin 30: Gestational diabetes. The American College of Obstetricians and Gynecologists.
March of Dimes. Undated. prenatal care, glucose screening.
Mayo Clinic. Undated. glucose challenge test.
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