What should you know about GDM 75 g OGTT?

OGTT means oral glucose tolerance test. After an overnight fast, a blood sample is taken, you drink a measured glucose solution, and further samples are collected at scheduled times. The results show how glucose changes after the drink rather than giving only a single fasting reading.

An unusual result does not tell you how you feel or predict your delivery by itself. Your maternity team interprets the readings using the laboratory method and pregnancy stage, then explains whether monitoring or treatment is needed.

Follow the clinic's fasting instructions exactly; ask whether plain water and regular medicines are allowed. Eat normally in the days before the appointment unless your clinician gives different advice. Bring a snack for afterwards, because you may feel hungry, light-headed, or briefly nauseated during the wait.

Plan to remain at the testing centre. Avoid eating, smoking, or strenuous activity during the collection period, since these can affect the reading. If you vomit or feel unwell, tell staff rather than leaving without advice; the test may need to be rearranged.

Contact your maternity team promptly if you cannot keep the glucose drink down, become faint, develop severe weakness, or have symptoms that concern you after the appointment. Seek urgent help for severe breathing difficulty, collapse, confusion, or heavy bleeding in pregnancy.

Ask when to stop food and drink, whether your medicines should be taken, how long the appointment will last, when results will be available, and what follow-up happens if a reading is outside the expected range.