Overview
The immediate-spin crossmatch is a serologic method that combines patient plasma/serum with a suspension of a specific donor unit's red cells, briefly incubates at room temperature, centrifuges, and reads for agglutination or hemolysis to detect ABO incompatibility. It includes no antiglobulin (AHG) phase.
Classification
| Step | Purpose |
|---|---|
| Combine donor cells + patient plasma/serum | Bring patient antibody into contact with donor antigen |
| Brief room-temperature incubation | Favor IgM-mediated agglutination if ABO-incompatible |
| Centrifuge | Concentrate cells for a visible reaction |
| Immediate macroscopic read | Detect agglutination/hemolysis |
Morphologic Features
Findings are macroscopic agglutination or hemolysis read immediately after centrifugation, no microscopic morphology assessment is part of this method.
Laboratory Characteristics
- No AHG phase, not designed to detect IgG-mediated incompatibility
- Restricted to patients with a negative antibody screen and no history of a clinically significant antibody
- Read immediately after centrifugation per SOP-specified timing and speed
- A positive result halts release of that unit regardless of patient eligibility profile
Reference Intervals
No numeric reference interval. Results are reported as compatible (no agglutination/hemolysis) or incompatible per unit. Incubation time and centrifuge parameters are method- and institution-specific, verify current SOP.
Clinical and Laboratory Significance
Immediate spin provides a fast, serologically confirmed ABO-compatibility check for a specific unit in patients who do not need AHG-phase testing, based on a negative antibody screen and clean antibody history.
Differential Considerations
True ABO incompatibility (agglutination/hemolysis reproducible on repeat) versus cold autoagglutination/rouleaux artifact versus technical error, differentiated using controls, repeat testing, and correlation with typing results per SOP.
Comparison Tables
Immediate-spin crossmatch interpretation
| Patient/result profile | Interpretation | Next step mindset |
|---|---|---|
| Negative screen, no history, negative immediate spin | Consistent with ABO compatibility | Proceed per remaining release steps |
| Negative screen, no history, positive immediate spin | ABO incompatibility suspected | Hold unit; investigate before release |
| Positive screen or antibody history, negative immediate spin | Not sufficient on its own | AHG phase still required |
| Positive screen or antibody history, positive immediate spin | Incompatibility indicated | Hold unit; investigate before release |
Classification Frameworks
Not applicable, laboratory test procedure, not a WHO disease classification.
Laboratory Notes
- Confirm eligibility (negative screen, no antibody history) before selecting this method
- A clean immediate-spin read never overrides a positive screen or antibody history, add the AHG phase in those cases
- See the Crossmatching and Electronic Crossmatch entries for method-selection context
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).
Frequently Asked Questions
Common questions about using this Immediate Spin Crossmatch additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
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