Glucose Challenge Test (GCT)
The Glucose Challenge Test is a screening test used during pregnancy to check for gestational diabetes. You drink a sugary solution, and your blood sugar is measured one hour later to see how your body processes glucose.
Glucose Tolerance Test (GTT)
The GTT measures how well your body processes sugar over time. After a fasting blood sample, you drink a glucose solution and have your blood drawn at set intervals (commonly 1, 2, and sometimes 3 hours later) to diagnose diabetes