Fetal medicine has emerged as a separate subspecialty over the last 30 years as a result of major advances in a number of areas, in particular ultrasound imaging, cytogenetics, molecular biology and biochemistry. The widespread use of antenatal screening and diagnostic tests has led to an increased need for obstetricians to have knowledge and skills in fetal medicine. This book provides the information that underpins training programmes in fetal medicine and integrates science and clinical disciplines in a practical and useful way.