Intrauterine Transfusion
Intrauterine transfusion (IUT) is a specialized fetal therapy used to treat severe fetal anemia, most commonly caused by red blood cell alloimmunization. The procedure delivers red blood cells directly to the fetus, correcting anemia and reducing the risk of heart failure or fetal loss.
The Johns Hopkins Center for Fetal Therapy team is highly experienced in performing intrauterine transfusions. Intrauterine transfusions are most often performed in the labor and delivery unit, where the setting allows for specialized procedural care alongside immediate obstetric support if needed. Using continuous ultrasound guidance, the transfusion is performed with precision and careful attention to fetal safety.
Every procedure is individualized based on the specific clinical circumstances.
The Procedure
Each intrauterine transfusion begins with a comprehensive ultrasound evaluation to assess fetal condition and determine the optimal transfusion site — typically the umbilical vein at the placental insertion. Once identified, local anesthesia is administered and a thin needle is inserted through the mother’s abdomen and uterus into the fetal circulation under constant ultrasound guidance.
The transfusion is performed using specially prepared red blood cells that meet strict standards for fetal use. The volume of blood delivered is calculated based on the severity of anemia and the weight of the fetus. Throughout the transfusion, both maternal vital signs and fetal well-being are closely monitored.
Depending on the condition and timing in pregnancy, more than one transfusion may be needed.
What to Expect During an Intrauterine Transfusion Procedure
Intrauterine transfusion, or IUT, is the most common treatment for fetal anemia. This animated patient education video walks you through what to expect when you receive an IUT at a fetal therapy specialty center.
Recovery and Follow-up
Following the procedure, patients can typically return home the same day. Ongoing weekly ultrasounds and fetal Doppler studies are scheduled to assess the fetal response and determine the need for additional transfusions.
In many cases, serial transfusions are required to support the fetus. Our team coordinates with referring obstetricians to plan continued prenatal care, delivery timing and neonatal support.
Long-Term Outlook
Intrauterine transfusions significantly improve outcomes for fetuses affected by alloimmunization-related anemia. Most babies treated with IUT go on to deliver at term and have normal development.
The Johns Hopkins Center for Fetal Therapy provides coordinated care from diagnosis through postnatal life. Our multidisciplinary team ensures that each family receives comprehensive support — including consultation with neonatology, transfusion medicine and pediatric specialists when needed.
