Glucose Tolerance Test (GTT) | Montreal

Yes, a valid medical requisition from your physician or nurse practitioner is required to perform both 1-hour and 2-hour Oral Glucose Tolerance Tests. We securely process your samples through our accredited partner laboratories, Dynacare and CDL, and forward the official results directly back to your healthcare provider.

For most pregnant women, the Glucose Tolerance Test (GTT) is routinely scheduled between weeks 24 and 28 of pregnancy. However, if you have certain risk factors, your physician may request an earlier screening requisition during your first trimester. 

For a 2-hour diagnostic test, strict fasting for at least 8 hours prior to the appointment is mandatory. For a 1-hour screening test, fasting is generally not required unless specifically instructed by your ordering physician. Always follow the precise guidelines written on your medical requisition and instructions sent to you by the Genexia team.

No. To ensure clinical accuracy, you must remain completely resting and sedentary during the 1 or 2-hour waiting intervals, as physical activity can artificially lower your blood sugar results. This requirement is why our private home service is highly recommended—it allows pregnant mothers to rest comfortably on their own couch or bed instead of sitting in a clinic waiting room.