Overview
Transfusion-related acute lung injury (TRALI) is an acute lung injury, new hypoxemia with bilateral pulmonary infiltrates, developing during or within hours of transfusion, without evidence of fluid overload or another cause, diagnosed clinically by the treating team. A recognized mechanism in some cases involves donor anti-HLA/anti-HNA antibodies reacting with recipient neutrophils; a non-antibody-mediated ('two-hit') model is also recognized.
Classification
| Proposed mechanism | Antibody source | Laboratory follow-up focus |
|---|---|---|
| Antibody-mediated | Donor anti-HLA/anti-HNA antibodies | Donor follow-up interface / donor antibody testing |
| Non-antibody-mediated ('two-hit') | No causative antibody identified | Component/recipient risk-factor review; no donor antibody confirmation expected |
Morphologic Features
Not a cell-morphology topic, this is a reaction-investigation and donor-interface reference.
Laboratory Characteristics
- Immediate notification of the clinical team's TRALI concern through the institutional reporting pathway
- Quarantine of the implicated unit and tubing
- Identification of other components from the same donation (and, per SOP, other recent donations from the same donor)
- Coordination of donor follow-up communication with the blood supplier per institutional SOP
- Documentation of the transfusion timeline, component/donation identifiers, and clinical team findings
Reference Intervals
Not applicable . TRALI diagnosis rests on clinical respiratory criteria (hypoxemia thresholds, imaging findings) determined by the treating team, not a laboratory reference range. Donor antibody testing turnaround and criteria are blood-supplier–specific; verify against current institutional/supplier protocol.
Clinical and Laboratory Significance
TRALI is diagnosed clinically; the laboratory's diagnostic-adjacent contribution is timely reporting, quarantine, and coordinating donor antibody investigation where pursued, none of which need to be complete or positive for the clinical diagnosis or hemovigilance reporting process to proceed.
Differential Considerations
Distinguish TRALI (donor-antibody or two-hit mechanism, often no fluid-overload evidence) from TACO (volume/cardiac overload), from anaphylactic transfusion reaction (rapid-onset hypotension/angioedema pattern), and from septic transfusion reaction (contamination-focused workup with fever/hemodynamic instability).
Comparison Tables
TRALI vs. TACO laboratory-support contrast
| Feature | TRALI | TACO |
|---|---|---|
| Underlying mechanism | Donor antibody (subset) or two-hit model | Volume overload / cardiac dysfunction |
| Fluid overload evidence | Typically absent | Present |
| Laboratory-support focus | Donor follow-up interface, unit/co-component quarantine | Documentation and reporting; not a donor-interface workup |
Classification Frameworks
Not applicable, laboratory reaction-investigation pathway, not a WHO disease classification.
Laboratory Notes
- Quarantine and donor-interface actions start on clinical suspicion, do not wait for a confirmed donor antibody result
- Track co-components from the same donation, not only the single implicated unit
- A negative or pending donor antibody result does not overturn a clinically diagnosed TRALI case
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).
- World Health Organization. Blood safety and availability / transfusion guidance (verify current WHO publication and institutional adoption).
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