ArticleClinical practice and cases in emergency medicine2025
The Complexity of Weak Rhesus Positivity in Pregnancy: Challenges and Management-A Case Report.
Article in Clinical practice and cases in emergency medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionDetermining a mother's Rhesus (Rh) antigen status is a critical component of prenatal care, guiding the administration of Rh immunoglobulin (RhIG) to prevent Rh alloimmunization, a condition that can lead to hemolytic disease of the newborn. Hemolytic disease of the newborn is a blood disorder where the blood types of a mother and fetus are incompatible and causes hemolysis of the fetus' erythrocytes, a major cause of fetal death. Rh immunoglobulin is commonly administered to Rh-negative (Rh-) women as a prophylactic measure. However, categorizing a patient's Rh status is not always straightforward as individuals can exhibit weakly Rh+ or formerly Rh+ phenotypes, complicating clinical management. CASE REPORT: We present a case of a 28-year-old gravida three para two woman whose Rh status has varied across multiple pregnancies, who presented to the emergency department (ED) with an active first trimester miscarriage requesting a dose of RhIG. Her blood typing indicated O+ status, which conflicted with her previous history of O-.
conclusionMost women in the United States are Rh+, which eliminates the need for RhIG during pregnancy. Nevertheless, approximately 550,000 women annually are categorized as Rh-, and 16,700 of these cases may represent weak Rh positivity. Identifying weakly Rh+ individuals holds potential to reallocate scarce RhIG resources to those who require them. In this report we explore the clinical implications of weak Rh positivity, emphasizing maternal-fetal health considerations and the nuanced approach required to manage such cases effectively in the ED.
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