Search 33,000+ CME courses
Back

StatPearls, LLC

  • Antibodies
  • Blood Grouping and Crossmatching
  • Blood Transfusion
  • Immune Sera
  • Isoantibodies

ABO Typing Discrepancies

The ABO blood group system is crucial for safe blood transfusions, classified into 4 types A, B, AB, and O based on the presence or absence of antigens A and B on red blood cells and corresponding antibodies in serum. To determine blood types, clinicians perform forward and reverse groupings by identifying ABO antigens on red blood cells and corresponding antibodies in serum. Forward grouping identifies antigens on red blood cells using anti-A and anti-B antisera, whereas reverse grouping identifies antibodies using prepared red cells to confirm the results. ABO discrepancies occur when forward and reverse grouping results do not align due to unexpected or missing reactions. These discrepancies can result from technical errors, weak antigens or antibodies, autoantibodies, alloantibodies, or abnormal proteins. Experts categorize ABO discrepancies into 4 types type I due to weak or missing antibodies, type II due to weak or missing antigens, type III due plasma or protein abnormalities leading to pseudo-agglutination, and type IV due to miscellaneous causes leading to false reactions. Proper resolution of these discrepancies is vital, as incorrect blood typing can lead to fatal hemolytic reactions. Thorough serological evaluations and patient history assessments are essential for maintaining transfusion safety. This activity for healthcare professionals is designed to enhance the learner’s competence in identifying and managing ABO discrepancies. Clinicians gain a deeper understanding of the implications and management of ABO discrepancies along with a heightened awareness of interprofessional collaboration for timely evaluation and management, leading to enhanced patient outcomes and reduced morbidity and mortality.

Credit & MOC Details

Credit information is provided by the course provider. We recommend confirming credit eligibility with the provider or your licensing board before starting the activity.

Credit types

AAPA Category 1 Credit™Up to 1.5 creditsAMA PRA Category 1 Credit™Up to 1.5 creditsNursingUp to 1.5 creditsPharmacyUp to 1.5 credits

MOC types

ABS — Accredited CMEUp to 1.5 pointsABOS — Accredited CMEUp to 1.5 pointsABPATH — Lifelong LearningUp to 1.5 pointsABA — Lifelong LearningUp to 1.5 pointsABTS — Accredited CMEUp to 1.5 pointsABIM — Medical KnowledgeUp to 1.5 pointsABS — Self-AssessmentUp to 1.5 pointsABP — Lifelong Learning and Self-AssessmentUp to 1.5 pointsABTS — Self-AssessmentUp to 1.5 points

FDA REMS

No

Qualifies for MIPS

No

Target Specialties

Cross-Specialty

Relevant across 8 specialties.

Pricing

Fee varies

This provider typically $49–98

See fees on statpearls.com

Listed by the provider

  • Article / monograph / reference
  • Credit · Up to 1.5 credits
  • MOC · Up to 1.5 points
  • Fee varies · this provider typically $49–98
  • Released
    Sep 1, 2026
  • Last day to claim credit
    Sep 1, 2029 3 years left

Related courses

See all

Other providers’ courses on the same topic

More from StatPearls, LLC

See all

This provider’s courses closest to this one