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Two-Hour Glucose Test for Gestational Diabetes

The two-hour glucose test helps to measure how your body is using sugar during your pregnancy. This test is important to do because pregnancy hormones can cause the level of sugar in your body to be too high. High levels of sugar are not good for you or your baby. If your sugar levels are high, they can be treated.

This test will tell your doctor if you have gestational diabetes (diabetes during pregnancy). If you do have gestational diabetes, this can be treated. Your doctor will talk with you more about this once the test results are back.

How do I prepare for this test?


  • You should have nothing to eat or drink after midnight the night prior to your test.
  • You should NOT change your diet at all before this test. Please eat as you normally would.

What will happen on the day of my test?


  • You will need to be at the office for two hours for this test.
  • You should report to Shapiro 8 at the time you were given. You will check in at the phlebotomy lab.
  • You will have your blood taken for the first time.
  • You will be given a sweet liquid called GLUCOLA to drink which you will need to drink entirely in about 5 minutes.
  • You will need to tell the phlebotomist what time you finished drinking the GLUCOLA.
  • Your blood will be drawn again one and two hours after you have finished drinking the GLUCOLA.
  • You may drink ONLY WATER during this test. You may eat and drink as usual once the third blood test has been done.

How will I know the results?


  • Your health care provider will have the results the day after the test and will discuss them with you.

Contact Information

Department of Obstetrics and Gynecology
Beth Israel Deaconess Medical Center
East Campus
330 Brookline Avenue
Boston, MA 02215
617-667-0475