Glucose Tolerance Test is a common diagnostic procedure used to assess how well the body processes sugar. This article provides a clear, detailed guide for the general public, patients, and their families about the purpose, types, process, and interpretation of the test. It begins with an explanation of glucose, its role in the body, and why regulating blood sugar is important for overall health. The article outlines what normal and abnormal glucose levels look like and who should consider getting the test done, such as people at risk for diabetes or pregnant women being screened for gestational diabetes. It describes different types of glucose tolerance tests, including the oral and intravenous versions, as well as the specific test used during pregnancy. The article covers how the test is performed, how to prepare for it, and what to expect on the day of testing. It explains what the results mean and why it is important to interpret them with the help of a healthcare provider. It also discusses the limitations of the test and when it might not give accurate results. The information is presented in simple terms to ensure it is understandable for all readers. This is part of the 'Public Education Series' initiative by Exon Publications.