Overview
Antibody identification uses a phenotyped reagent cell panel and systematic rule-out/rule-in logic against the panel antigram to determine the specificity (or specificities) of an antibody flagged by a positive antibody screen.
Classification
| Step | Logic | Output |
|---|---|---|
| Rule out | Antigen-positive, nonreactive cell excludes that antigen's antibody | Shortened candidate list |
| Rule in | Antigen present on every reactive cell remains a candidate | Leading specificity |
| Confirm | Reaction pattern/strength and phenotype consistency checked | Reportable identification or referral |
Morphologic Features
Not a cell-morphology topic. Findings are agglutination/hemolysis patterns read against a manufacturer antigram across a multi-cell reagent panel.
Laboratory Characteristics
- Transcribe reactions accurately before applying rule-out logic
- Prefer homozygous, antigen-negative cells to rule out dosage-sensitive specificities when available
- Reassess unexplained reactivity for a second concurrent antibody
- Phenotype the patient when transfusion history/SOP allow a valid result to support the call
Reference Intervals
No numeric reference interval. Panel composition, enhancement/enzyme technique protocols, and referral thresholds are manufacturer- and institution-specific, verify current SOP.
Clinical and Laboratory Significance
A correct identification determines antigen-negative unit requirements, crossmatch strategy, and, in pregnancy, which specificities warrant guideline-driven obstetric alloimmunization follow-up.
Differential Considerations
Single alloantibody vs multiple alloantibodies vs dosage-effect pattern mimicking inconsistency vs high-prevalence-antigen antibody exceeding local panel capability (needs reference lab referral).
Comparison Tables
Antibody identification triage
| Panel finding | Suggests | Next step mindset |
|---|---|---|
| All reactive cells share one antigen; clean rule-outs | Single specificity | Confirm phenotype; select antigen-negative units |
| Variable strength across reactive cells, same antigen | Dosage effect | Confirm with homozygous cells |
| Reactivity unexplained after ruling in one antibody | Possible second antibody | Continue rule-out on remaining pattern |
| Pattern exceeds local panel's antigen coverage | High-prevalence-antigen candidate | Reference laboratory referral |
Classification Frameworks
Not applicable, laboratory test procedure, not a WHO disease classification.
Laboratory Notes
- Rule-out logic, not reaction strength alone, determines specificity
- Homozygous rule-out cells matter most for Kidd/Duffy/MNS-type dosage
- Know your panel's limits, referral is a competent outcome, not a failure
References
Authoritative textbooks, guidelines, and reviews supporting this reference entry. Verify reference intervals, critical limits, and reflex criteria against institutional protocols and current guideline editions.
Textbooks
- Cohn CS, Delaney M, Johnson ST, Katz LM, eds. Technical Manual. 21st ed. AABB; 2023.
- Harmening DM. Modern Blood Banking & Transfusion Practices. 7th ed. F.A. Davis; 2019.
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
CLSI and Professional Guidelines
- AABB. Standards for Blood Banks and Transfusion Services (verify current edition and institutional adoption).
- Clinical and Laboratory Standards Institute. Related immunohematology and specimen identity standards (verify current documents and institutional adoption).
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