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Blood group antibody screening tests during pregnancy
British Journal of Obstetrics and Gynaecology
|October 1, 1986
Summary
A study of antenatal patients found atypical red blood cell antibodies in 0.95% of cases. Many antibodies were not detected initially, highlighting the need for optimized antenatal testing protocols to ensure maternal and newborn safety.
Area of Science:
- Immunology
- Transfusion Medicine
- Obstetrics
Background:
- Atypical red blood cell antibodies in pregnant individuals pose risks for haemolytic disease in the newborn and transfusion reactions.
- Previous studies indicate varying prevalence and detection rates of these antibodies.
Purpose of the Study:
- To determine the prevalence of atypical red blood cell antibodies in antenatal patients.
- To assess the timing of antibody development during pregnancy.
- To define an optimal antenatal testing protocol for maximum clinical safety and resource efficiency.
Main Methods:
- Analysis of 667 sera from approximately 70,000 antenatal patients over a 2-year period.
- Identification and characterization of 726 atypical red blood cell antibodies.
- Evaluation of antibody detection rates at different gestational stages.
Main Results:
- Prevalence of atypical antibodies was 0.95% (726 antibodies in 667 sera).
- 30% of antibodies were not detected in initial testing; 50% of antibody-producing patients had undetectable antibodies at 28 weeks gestation.
- Rhesus (D) group provided limited predictive value for antibody formation beyond specific rhesus antigens.
Conclusions:
- Late-onset antibody development is significant, posing risks for haemolytic disease and transfusion reactions.
- An optimized antenatal testing protocol is proposed, considering antibody production throughout pregnancy.
- The proposed protocol aims to balance clinical safety with efficient resource utilization in antenatal screening.