Fetal Anemia Management and Intrauterine Transfusion Techniques

Fetal anaemia arises when the developing foetus has insufficient red blood cells or haemoglobin, most commonly due to maternal alloimmunisation or fetomaternal haemorrhage. Early detection relies on serial antibody screening, Doppler assessment of the middle cerebral artery peak systolic velocity (MCA-PSV) and, where indicated, cordocentesis for direct measurement of foetal haemoglobin. Prophylactic strategies include Rh immunoglobulin administration to rhesus-negative mothers and close monitoring of non-Rh antibodies. When moderate to severe anaemia is confirmed, intrauterine transfusion (IUT) remains the cornerstone of therapy. Current practice favours intravascular transfusion into the umbilical vein under ultrasound guidance, which offers rapid correction of haemoglobin levels and minimises the volume required. Alternative routes, such as intraperitoneal infusion, persist in centres without direct vascular access but carry slower haematological response. Timing of the first transfusion, the choice of blood product and the interval between procedures are tailored to gestational age, severity of anaemia and presence of hydrops fetalis. Advances in imaging and needle guidance have reduced procedure-related complications, yet risks of preterm labour, rupture of membranes and alloimmune recurrence underline the need for multidisciplinary care. Post-transfusion surveillance extends into the neonatal period, as late-onset anaemia and neurodevelopmental sequelae may arise.

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Fetal Anemia Management and Intrauterine Transfusion Techniques publication trend

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Technical terms

Fetal anaemia: deficiency of red blood cells or haemoglobin in the unborn child, leading to tissue hypoxia and cardiac compensation.

Alloimmunisation: maternal immune sensitisation against foetal red cell antigens, resulting in antibody-mediated haemolysis.

Middle cerebral artery peak systolic velocity (MCA-PSV): Doppler ultrasound measurement that correlates with foetal blood viscosity and predicts severity of anaemia.

Intrauterine transfusion (IUT): percutaneous administration of donor red blood cells to the foetus, most commonly via the umbilical vein under ultrasound guidance.

Hydrops fetalis: pathological fluid accumulation in two or more foetal compartments, indicating severe anaemia or cardiac failure.

References

1. Hemolytic disease of the fetus and newborn: systematic literature review of the antenatal landscape. BMC Pregnancy and Childbirth (2023).
2. Distribution of maternal red cell antibodies and the risk of severe alloimmune haemolytic disease of the foetus in a Chinese population: a cohort study on prenatal management. BMC Pregnancy and Childbirth (2020).
3. Fetal and neonatal outcome in severe alloimmunization managed with intrauterine transfusion: 18-year experience in a tertiary referral hospital in China. Frontiers in Pediatrics (2023).