How to Prepare for the Gestational Diabetes Screening Test

Gestational diabetes is a form of diabetes that can occur with pregnancy. Women who develop gestational diabetes typically have normal blood sugar before and after becoming pregnant, but may be at increased risk of developing diabetes later in life. An oral glucose tolerance test is used to test a pregnant woman’s ability to use sugar properly.

1. Ensure your doctor is aware of any medications you are taking when your gestational diabetes screening test is ordered. Certain medications may alter the final results of the test and your doctor may want you to suspend their use for a few days.


2. Eat a carbohydrate rich diet for at least three days before your test. Consume at least 150 grams of carbohydrates each of the three days.


3. Refrain from eating or drinking anything except water for at least eight hours before your screening. Consumption of any food or beverage will affect your glucose level and alter the results of your test.


4. Abstain from exercising the day of your gestational diabetes screening. Exercise will increase your need for food and may lower your glucose level.


5. Drink a lot of water the morning of your test. If you are dehydrated, it may be difficult for the phlebotomist to collect your blood.


6. Prepare to be at the laboratory for quite awhile. The tests are conducted over a four-hour period. Make any necessary arrangements to free up the time you will need.


7. Dress comfortably the day of the test. You will have four blood tests; so wear something loose in the arms or short sleeve.