Overview
Febrile non-hemolytic transfusion reaction (FNHTR) is a temperature rise (with or without chills) during or shortly after transfusion, attributed to cytokine accumulation during component storage and/or recipient antibodies reacting with donor leukocytes or leukocyte fragments. It is a diagnosis of exclusion, assigned only after the standard hemolysis workup is negative and there is no indication of bacterial contamination.
Classification
| Proposed mechanism | Component association | Risk-modifying factor |
|---|---|---|
| Cytokine accumulation during storage | Especially platelet components | Storage duration |
| Recipient leukocyte antibody vs. donor leukocytes/fragments | Cellular components (red cells, platelets) | Leukoreduction status |
Morphologic Features
Not a cell-morphology topic, this is a reaction-classification and exclusion-workup reference.
Laboratory Characteristics
- Clerical check must show no discrepancy
- Visual inspection of post-reaction plasma/serum must be unremarkable (no hemoglobinemia)
- DAT must be negative
- ABO/Rh recheck must be concordant
- No unit appearance or clinical severity suggesting bacterial contamination
Reference Intervals
Not applicable in the quantitative sense, institutional fever thresholds that trigger a stop-transfusion/workup (e.g., a defined temperature rise from baseline) are SOP-specific; verify against current institutional protocol.
Clinical and Laboratory Significance
FNHTR is reached only by exclusion; its diagnostic significance is really about what has been ruled out (hemolysis, and where relevant, contamination) rather than a specific positive confirmatory test. Leukoreduction and storage duration are documented as contextual risk information.
Differential Considerations
Distinguish FNHTR from ABO-incompatible AHTR (clerical error, hemoglobinemia, positive DAT, ABO mismatch), from septic transfusion reaction (unit appearance, hemodynamic instability, culture-positive pathway), and from allergic reactions (urticaria/pruritus pattern rather than fever as the dominant feature).
Comparison Tables
FNHTR exclusion workup at a glance
| Workup element | FNHTR-consistent result | Result suggesting a different category |
|---|---|---|
| Clerical check | No discrepancy | Discrepancy → consider AHTR |
| Visual inspection | Unremarkable | Hemoglobinemia → consider AHTR |
| DAT | Negative | Positive → consider AHTR |
| Unit appearance / severity | Unremarkable, proportionate fever | Contamination signs or hypotension → consider septic reaction |
Classification Frameworks
Not applicable, laboratory reaction-classification pathway, not a WHO disease classification.
Laboratory Notes
- Never assign FNHTR before completing the hemolysis exclusion workup, regardless of how typical the presentation looks
- Leukoreduction lowers FNHTR risk but does not eliminate it as a possibility
- Disproportionate severity (e.g., high fever with hypotension) should prompt the septic-reaction pathway instead of a default FNHTR label
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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