 Hello everybody, I am Dr. Hashita, I am working as a consultant endocrinologist at Manipal Hospital's Jainaka Bangalore, today we will be discussing about gestational diabetes mellitus or diabetes in pregnancy. It is also abbreviated as GDM. So what is GDM? When high sugars are detected for the first time in pregnancy, then we call it as GDM. So when is this normally tested? We normally test it between 24 to 28 weeks of pregnancy and what is this test? The most routinely asked test is called 75 grams OGTT. OGTT means oral glucose tolerance test. So what is the procedure for this test? So the mother goes in fasting state to the lab. She is given a solution that contains 75 grams of glucose which she is asked to drink. Three blood samples are drawn. The first sample is in the fasting before she drinks the glucose and two more samples after she drinks the glucose, one at the first hour, the next at the second hour. So if any of these three readings, either the fasting or one hour or two hours, if any of these is abnormal, then it is considered as gestational diabetes mellitus.