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[Antibody detection after antepartal rhesus prophylaxis: normal values or sensitization]
Geburtshilfe Und Frauenheilkunde
|May 1, 1993
Summary
Antibody screening in pregnant women shows the ID-microtyping-system (IDM) detects anti-D antibodies more effectively than the indirect Coombs test (ICT) after Rh immune prophylaxis. Postpartum prophylaxis is still recommended, even with detected antibodies.
Area of Science:
- Immunology
- Obstetrics
- Hematology
Context:
- Rh immune prophylaxis is crucial for preventing hemolytic disease of the newborn.
- Assessing antibody response after antepartum prophylaxis is essential for patient management.
- Standard antibody screening methods may have limitations in sensitivity.
Purpose:
- To compare the sensitivity of the indirect Coombs test (ICT) and the ID-microtyping-system (IDM) for detecting anti-D antibodies after antepartum Rh immune prophylaxis.
- To evaluate the persistence of anti-D antibodies and the need for postpartum prophylaxis.
Summary:
- Antibody screening was conducted on 29 unsensitized pregnant women post-antepartum Rh immune prophylaxis using ICT and IDM.
- IDM detected anti-D antibodies in 97% of women for up to 11 weeks, with higher sensitivity and titers compared to ICT (85% detection).
- Postpartum screening revealed persistent anti-D titers in a significant proportion of patients (42% ICT, 60% IDM), necessitating continued monitoring and prophylaxis.
Impact:
- The ID-microtyping-system (IDM) offers superior sensitivity for detecting anti-D antibodies compared to the indirect Coombs test (ICT).
- Maternal isoimmunization to RhD antigen requires careful monitoring, even with detected antibody titers post-prophylaxis.
- Postpartum Rh immune prophylaxis is recommended even when anti-D antibodies are detected after antepartum prophylaxis to prevent potential isoimmunization.