Should anti-D immunoglobulin be given antenatally?

Area of Science:

• Immunology
• Obstetrics
• Perinatology

Background:

• Rh-haemolytic disease of the newborn (HDFN) is a serious condition.
• Sensitization occurs when Rh-negative mothers are exposed to Rh-positive fetal blood.
• Preventive measures like anti-D immunoglobulin (Ig) have significantly reduced HDFN incidence.

Purpose of the Study:

• To assess the effectiveness of current anti-D Ig protocols in preventing Rh sensitization.
• To evaluate the potential impact of antenatal anti-D Ig administration.
• To determine the cost-effectiveness of universal antenatal anti-D Ig in Britain.

Main Methods:

• Survey of 246 Rh-negative expectant mothers with first-time Rh antibodies.
• Analysis of sensitization timing (postpartum vs. antenatal).
• Evaluation of perinatal mortality and morbidity data in Britain.

Main Results:

• Approximately 50% of sensitization could have been prevented with postpartum anti-D Ig after a previous Rh-positive delivery.
• The remaining sensitization required antenatal anti-D Ig administration.
• Current low perinatal mortality from HDFN in Britain renders universal antenatal anti-D Ig not cost-effective.

Conclusions:

• Postpartum anti-D Ig administration is crucial and can prevent sensitization in about 50% of cases.
• Antenatal anti-D Ig is necessary for preventing sensitization in other cases.
• Targeted postpartum anti-D Ig for all Rh-negative mothers with Rh-positive infants/abortions is the most effective strategy to reduce the remaining cases.