The three major ultrasound examinations during pregnancy, also known as structural ultrasounds, are intended to provide a detailed look at the fetus's development at different stages. These examinations provide valuable information about the baby's health and growth, as well as any potential abnormalities or complications. The main goals of each of these examinations are described below: 1. Terminal ultrasound (around 12 weeks): The first ultrasound examination, also known as the dating ultrasound, is usually performed between 10 and 14 weeks of pregnancy. Purpose: The dating ultrasound is used to accurately determine the gestational age and establish the due date. It involves examining the size of the fetus and the development of important structures such as the heart and brain. 2. 20-week ultrasound (around 20-22 weeks): The second major ultrasound examination is the 20-week ultrasound, which usually takes place between 20 and 22 weeks of pregnancy. Purpose: The 20-week ultrasound, also known as the structural ultrasound, is intended to examine the fetus's anatomy in detail. It involves assessing all major organs and structures of the fetus to detect any abnormalities early on. This includes the heart, brain, spine, kidneys, face, arms, and legs. 3. Growth ultrasound (around 30 weeks): The third major ultrasound examination, the growth ultrasound, is usually performed around 30-32 weeks of pregnancy. Purpose: This ultrasound is used to monitor the growth and development of the fetus. It involves checking the size and weight of the fetus, the growth of organs, and other important parameters. It helps detect any growth delays or other issues that could affect the fetus's health. These three ultrasound examinations play a crucial role in monitoring the health and development of the fetus throughout pregnancy. They allow for the early detection of any abnormalities or complications, enabling appropriate care and possible interventions if necessary.