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Related Concept Videos

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Blood Typing

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Understanding an individual's blood group is a critical component of transfusion medicine. It ensures compatibility in blood transfusions, organ transplants, and even during pregnancy. Determining these blood groups involves the ABO and Rh blood typing systems, utilizing specific antigens and corresponding anti-sera to identify an individual's blood type.
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Detection of Antibodies That Neutralize the Cellular Uptake of Enzyme Replacement Therapies with a Cell-based Assay
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Evaluation of solid-phase panreactivity with negative direct antiglobulin testing.

J T Little1, D P Blackall2

  • 1Medical Laboratory Scientist, Providence Health and Services, Department of Pathology and Laboratory Services, Portland, OR, United States.

Immunohematology
|January 5, 2024
PubMed
Summary

Nonspecific panagglutinins in solid-phase red cell adherence (SPRCA) testing, despite negative direct antiglobulin tests (DAT), are often warm-reactive autoantibodies. These reactions do not appear clinically significant and can be managed with alternative methods like polyethylene glycol (PEG).

Keywords:
antibodydirect antiglobulin testred blood cellsolid-phase red cell adherencewarm-reactive autoantibody

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Area of Science:

  • Transfusion Medicine
  • Immunoserology
  • Clinical Pathology

Background:

  • Solid-phase red cell adherence (SPRCA) is a sensitive method for antibody detection.
  • Nonspecific panagglutinins can occur in SPRCA, presenting as a positive reaction with a negative direct antiglobulin test (DAT).
  • Understanding the clinical significance and serologic characteristics of these reactions is crucial for accurate blood banking practices.

Purpose of the Study:

  • To define the clinical characteristics of patients exhibiting nonspecific panagglutinins in SPRCA testing.
  • To investigate the associated serologic findings, including eluate testing and hemolysis assessment.
  • To determine the clinical significance of SPRCA-only panagglutinins.

Main Methods:

  • Retrospective analysis of 20 patients with panreactive SPRCA results and negative DAT, polyethylene glycol (PEG) antibody detection, and PEG autocontrol.
  • Evaluation of SPRCA panreactivity strength and eluate testing using both tube and SPRCA methods.
  • Assessment of patient clinical data, including age, sex, primary diagnosis, and evidence of hemolysis.

Main Results:

  • No clinical or laboratory evidence of hemolysis was found in the 20 evaluated patients (14 female, 6 male; average age 44).
  • Most eluates showed panreactivity, consistent with warm-reactive autoantibodies, particularly when tested by SPRCA (85%) compared to PEG (55%).
  • SPRCA-only panagglutination was identified as a distinct plasma reactivity pattern, often stronger in SPRCA eluates than PEG eluates.

Conclusions:

  • Nonspecific panagglutinins in SPRCA, despite negative DAT and PEG tests, are typically warm-reactive autoantibodies.
  • These "interfering" panagglutinins do not appear to be clinically significant in the studied patient population.
  • Alternative testing methods, such as PEG, can effectively manage and differentiate these reactions, ensuring accurate antibody detection.