The Oral Glucose Tolerance Test (OGTT) is commonly used to evaluate how your body processes glucose. It plays an important role in diagnosing prediabetes, diabetes, and gestational diabetes by measuring blood sugar levels before and after consuming a gluc... moreThe Oral Glucose Tolerance Test (OGTT) is commonly used to evaluate how your body processes glucose. It plays an important role in diagnosing prediabetes, diabetes, and gestational diabetes by measuring blood sugar levels before and after consuming a glucose drink. Understanding how the test works and what the results mean can help you better interpret your health information.