The aim of obstetrics care is to improve and optimise the outcome of pregnancy. Our objective is to avoid preventable death, disease and disability in children. Cordocentesis, also known as percutaneous umbilical blood sampling, is a critical diagnostic procedure that has significantly advanced fetal medicine. This technique allows for the direct collection of fetal blood, offering valuable insights into fetal physiology, metabolism, and disease. By providing access to real-time data on fetal blood gases, hemoglobin levels, and genetic information, cordocentesis has enabled healthcare professionals to diagnose and manage conditions such as fetal anemia, infections, and genetic disorders with greater accuracy. The procedure has proven particularly beneficial in cases of nonimmune hydrops, severe growth restriction, and structural anomalies, allowing for precise diagnosis and tailored interventions. Furthermore, it has facilitated the correlation of fetal blood data with Doppler ultrasound and fetal heart rate patterns, enhancing the understanding of fetal wellbeing. While cordocentesis carries some risks, including the potential for fetal loss and complications like bradycardia, its ability to provide critical information in highrisk pregnancies has made it an invaluable tool in modern obstetrics. Overall, cordocentesis has revolutionized prenatal care by offering access to direct fetal circulation thus opening new areas of prenatal diagnosis and therapy and a means of diagnosing and managing fetal conditions that would otherwise be difficult or impossible to detect