Overview
Laboratory blood typing is the controlled process of determining ABO and Rh D status using validated reagents, required controls, and forward/reverse correlation before result release.
Classification
| Step | Input | Output |
|---|---|---|
| Accept | Labeled specimen | Accepted or rejected |
| QC | Reagent lots | Pass/fail status |
| Forward | Patient RBCs + antisera | Antigen pattern |
| Reverse | Plasma + A1/B cells | Antibody pattern |
| Rh | Patient RBCs + anti-D | D status (± weak D path) |
| Release | Concordant results | Reportable blood group |
Morphologic Features
Not morphologic, visual endpoint is agglutination per method platform.
Laboratory Characteristics
- Tube, gel/column, or solid-phase platforms
- Lot-specific antisera and reagent cells
- Daily and change-of-lot QC per SOP
- LIS flags for discrepancy and historical mismatch
Reference Intervals
No numeric reference intervals. Acceptable QC reactions, centrifugation parameters, and grading criteria are method- and institution-specific, verify package inserts and SOPs.
Clinical and Laboratory Significance
Valid ABO/Rh typing underpins safe RBC selection, plasma compatibility logic, and perinatal Rh management pathways defined locally.
Differential Considerations
When typing fails: separate identity errors, QC failures, technical grading errors, and true biologic discrepancies before repeating endlessly.
Comparison Tables
Validity decisions
| Situation | Allowed? | Action |
|---|---|---|
| QC failed; patient pending | No patient release | Fix QC / alternate validated reagents |
| STAT OR; QC pending | No silent skip | Complete QC or SOP emergency product path |
| Forward ≠ reverse | No final ABO yet | Discrepancy workup |
Classification Frameworks
Not applicable.
Laboratory Notes
- Check expiry and appearance of antisera and reagent cells each use day
- Historical type conflicts require investigation even if today’s run looks clean
- Document who released the type and any supervisory review
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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