The 12-week scan, also known as the first trimester scan or dating scan, is one of the most important early pregnancy milestones. It provides reassurance, checks your baby’s early development and gives essential clinical information that guides pregnancy care. This guide explains what the 12-week scan involves, what it checks for and how it helps your obstetric team monitor your pregnancy safely. What Is the 12 Week Scan? The 12-week scan is an ultrasound performed between 11