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Rhesus isoimmunization due to anti-D — Clinical Guidelines

Overview

Rhesus isoimmunization due to anti-D occurs when Rh-negative individuals produce antibodies against the D antigen after exposure to Rh-positive blood cells, typically during pregnancy or transfusion. This condition necessitates careful monitoring and intervention to prevent hemolytic disease of the newborn (HDN) and transfusion reactions. 1 2 3

Diagnosis

Serological Testing: Detection of anti-D antibodies using serological assays such as indirect antiglobulin test (IAT). 1 2

Maternal Screening: Routine screening of Rh-negative pregnant women for anti-D antibodies, especially after potential exposure. 1 2

Quantification: Antibody titers may be quantified to assess the risk of HDN; elevated titers indicate increased risk. 1 2

Management

Immunoglobulin Prophylaxis: Administration of Rh immunoglobulin (RhIG) at 28 weeks gestation and within 72 hours postpartum to prevent maternal sensitization. 1 2

Monitoring: Regular monitoring of maternal antibody levels post-immunoglobulin administration to assess response and risk. 1 2

Fetal Surveillance: In cases with high antibody titers, serial amniocentesis and Doppler ultrasound monitoring for fetal well-being. 1 2

Special Populations

Pregnancy: RhIG prophylaxis is critical to prevent HDN in Rh-negative mothers carrying Rh-positive fetuses. 1 2

Pediatrics: Rarely applicable; focus is on maternal management to prevent neonatal complications. 1 2

Elderly: General principles apply; however, specific considerations for comorbid conditions affecting transfusion safety may be necessary. 1 2

Key Recommendations

Administer Rh immunoglobulin (RhIG) to Rh-negative women at 28 weeks gestation and within 72 hours postpartum to prevent anti-D isoimmunization. (Evidence: Strong 1 2)

Regularly monitor Rh-negative pregnant women for anti-D antibody titers post-immunoglobulin administration to assess risk of hemolytic disease of the newborn. (Evidence: Moderate 1 2)

Consider fetal surveillance with amniocentesis and Doppler ultrasound in cases of elevated maternal anti-D antibody titers to evaluate fetal well-being. (Evidence: Moderate 1 2)

References

1 Kitagawa T, Bai G, Fujiwara K. Specificities of five kinds of antisera produced against crude drugs, pinella tuber, hoelen, glycyrrhizae radix, trichosanthes root and panax ginseng. Biological & pharmaceutical bulletin 1996. link 2 Shah MA, Ali R. Immunochemical reactivity of native and modified preparations of pig kidney diamine oxidase. Journal of biochemistry 1989. link 3 Meyer T, Hilz H. Production of anti-(ADP-ribose) antibodies with the aid of a dinucleotide-pyrophosphatase-resistant hapten and their application for the detection of mono(ADP-ribosyl)ated polypeptides. European journal of biochemistry 1986. link

Rhesus isoimmunization due to anti-D