One-Hour Glucose

One-Hour Glucose Test

Also known as: Pregnancy screen, one-hour post 50 gm glucola

During the second trimester of your pregnancy, your doctor may have you screened for gestational diabetes by ordering a one-hour glucose test. Gestational diabetes is a condition that may occur between 24 and 28 weeks of a pregnancy, when the placenta produces hormones that can interfere with a woman’s insulin function, causing her blood sugar level to rise. If untreated, this condition can lead to complications and health problems for the baby. An elevated glucose level in your blood may indicate that you have this condition. Depending on the test results, your doctor may order a glucose tolerance test for a more conclusive result.

How to Prepare

  • The test may be performed on a walk-in basis; you do not need to schedule an appointment.
  • Your doctor (or the lab) will give you a sugar solution, called glucola, to drink. Make sure you drink the entire amount  within a five-minute period
  • Note the time. You will need to have your blood drawn for the test one hour after you finish drinking the glucola
  • Do not eat or drink anything during this hour.
  • Arrive at the lab at least 20 to 30 minutes before the hour is up. Wear clothing with sleeves that are easily rolled up.
  • Register and inform the clerk you have a timed test. A phlebotomist will draw blood from your arm at the appropriate time.

Time Required

Registration at the lab and drawing of blood for the test will take approximately 30 to 45 minutes. Results from the test are typically sent to your doctor within days; be assured, however, that any critical results are communicated immediately. Your doctor will discuss your test results with you once he or she has reviewed them.


Michigan law requires that a valid order signed by an authorized person be presented before any laboratory test or procedure can be conducted. Authorized persons are defined as physicians, physician assistants, or nurse practitioners. These professionals are legally responsible for interpreting the results of tests based on their knowledge of the individual patient.

Related Locations