Overview
The Kidd blood group system includes antithetical antigens Jka and Jkb; corresponding alloantibodies are clinically significant, often show dosage, may evade detection through evanescence, and are classically linked to delayed hemolytic transfusion reactions.
Classification
| Phenotype | Antigens | Notes |
|---|---|---|
| Jk(a+b−) | Jka | Double-dose Jka for dosage teaching |
| Jk(a−b+) | Jkb | Double-dose Jkb |
| Jk(a+b+) | Both | Single-dose each |
| Jk(a−b−) | Neither | Rare; anti-Jk3 risk |
Morphologic Features
Not a cell-morphology topic. Serologic screen/panel patterns; phenotype with anti-Jka/anti-Jkb.
Laboratory Characteristics
- AHG detection; may be weak or enhancement-dependent
- Enzyme panels often enhance Kidd reactivity
- LIS historical antibody alerts are safety-critical
- Antigen-negative units for current and historical Kidd antibodies
Reference Intervals
No numeric reference intervals. Criteria for homozygous rule-out cells and enhancement media are method/SOP-specific, verify locally.
Clinical and Laboratory Significance
Failure to honor Kidd antibodies (especially historical) is a leading educational example of preventable DHTR. Antigen-negative selection and reaction workups protect patients.
Differential Considerations
Weak AHG pan-pattern vs dosage-restricted Kidd vs multiple antibodies vs complement-dependent serology, use homozygous cells, enzymes, phenotype, and history.
Comparison Tables
Kidd risk map
| Feature | Kidd teaching point | Action |
|---|---|---|
| Dosage | Homozygous > heterozygous reactions | Use proper rule-out cells |
| Evanescence | Screen may turn negative | Keep historical antibody active |
| DHTR | Delayed hemolysis after re-exposure | Antigen-negative RBCs; reaction workup |
| Enzymes | Often enhance | Contrast with Duffy/MNS destruction |
Classification Frameworks
Not applicable, blood group system (ISBT JK), not a WHO disease classification.
Laboratory Notes
- Never let a negative screen erase historical anti-Jka/anti-Jkb
- Investigate post-transfusion hemolysis even if discharge screen was negative
- Anti-Jk3 needs rare-donor planning
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).
- U.S. Food and Drug Administration. Code of Federal Regulations Title 21 . Blood and Blood Components (verify current institutional adoption).
Frequently Asked Questions
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