This is an important test for the health and safety of you and your baby. A glucose tolerance test measures how well your body is able to absorb glucose or sugar after you ingest a given amount of sugar.
Doctors use a glucose tolerance test to diagnose the various types of diabetes, in particular, gestational diabetes. Doctors also use fasting blood sugar and haemoglobin A1c levels to evaluate diabetes. This is measured via a blood test. Undiagnosed gestational diabetes could harm you and your baby.
If you're well, it's really important you go to all your appointments and scans for the health of you and your baby. If you're pregnant, hospitals and clinics are making sure it's safe for you to go to appointments. They will advise you what to do. Any woman can develop gestational diabetes during pregnancy, but you're at an increased risk if:.
If any of these apply to you, you should be offered screening for gestational diabetes during your pregnancy. Most cases are only discovered when your blood sugar levels are tested during screening for gestational diabetes. Some women may develop symptoms if their blood sugar levels gets too high hyperglycaemia , such as:. But some of these symptoms are common during pregnancy and are not necessarily a sign of gestational diabetes.
Speak to your midwife or doctor if you're worried about any symptoms you're experiencing. Having gestational diabetes also means you're at an increased risk of developing type 2 diabetes in the future. During your first antenatal appointment also called a booking appointment at around week 8 to 12 of your pregnancy, your midwife or doctor will ask you some questions to determine whether you're at an increased risk of gestational diabetes. If you have 1 or more risk factors for gestational diabetes you should be offered a screening test.
Metzger BE. Diabetes mellitus and pregnancy. Endocrinology: Adult and Pediatric. Philadelphia, PA: Elsevier Saunders; chap Diabetes in pregnancy. Updated by: John D. Editorial team. Glucose screening tests during pregnancy. How the Test is Performed. 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. For this test: DO NOT eat or drink anything other than sips of water for 8 to 14 hours before your test.
You also cannot eat during the test. You will be asked to drink a liquid that contains glucose, grams g. You will have blood drawn before you drink the liquid, and again 3 more times every 60 minutes after you drink it. Each time, your blood glucose level will be checked. Allow at least 3 hours for this test. Be at the office 30 minutes after finishing the cola. This is to insure that you are at the clinic on time for your blood work which will be drawn 1 hour after drinking the cola.
When you check in at the fron desk, be sure and tell the receptionist what time you finished drinking the cola. How to Prepare - 3 hour test If your doctor would like to see additional testing, based on your results from the 1 hour test, you may be asked to have a 3 hour OGTT. Here is the best method of preparation: Eat a balanced diet that contains at least grams of carbohydrates per day for 3 days before the test.
Fruits, breads, cereal, rice, crackers, and starchy vegetables such as potatoes, beans and corn are good sources of carbohydrates. Do not eat, drink, smoke, or exercise strenuously for at least 8 hours before your first blood sample is taken.
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