Overview
TACO is hydrostatic pulmonary edema precipitated by transfusion, most often in patients with reduced cardiac or renal reserve who receive product in a volume or at a rate their circulation cannot accommodate. It is a clinical diagnosis made by the treating team; the laboratory's role is reaction workup, documentation review, and reporting classification, not diagnosis or treatment.
Classification
| Feature | TACO |
|---|---|
| Category | Non-immune, non-infectious complication (circulatory overload) |
| Onset window | During transfusion or within hours after |
| Typical component association | Any component; often larger-volume red cell transfusion |
Morphologic Features
Not applicable . TACO is a clinical/radiographic syndrome, not a cell-morphology finding.
Laboratory Characteristics
- Standard hemolysis workup (clerical check, visual plasma inspection, DAT, repeat ABO/Rh) is expected to be negative in isolated TACO
- Documentation review covers component type, volume issued, and recorded infusion rate/timing
- Laboratory does not perform or interpret chest imaging or natriuretic peptide testing, these are clinical/general-lab tests reviewed from the record
- Reporting classification is finalized once the clinical team's assessment is documented
Reference Intervals
Not applicable . TACO has no laboratory reference range. Supportive clinical findings (e.g., elevated BNP/NT-proBNP relative to baseline) are interpreted by the clinical team, not the transfusion laboratory.
Clinical and Laboratory Significance
Correct recognition and reporting of TACO matters for hemovigilance surveillance and for guiding future transfusion planning for at-risk patients, but the diagnostic determination itself is clinical. The laboratory's documentation supports that determination and the resulting reporting record.
Differential Considerations
Primary differential is TRALI, given the overlapping presentation of acute respiratory distress and hypoxia during or after transfusion. Acute hemolytic transfusion reaction and septic transfusion reaction are excluded via the standard workup (hemolysis markers, clerical check, and, if indicated, culture) rather than by the respiratory picture alone.
Comparison Tables
TACO vs. TRALI, documentation clues for reporting classification
| Discriminating feature | TACO | TRALI |
|---|---|---|
| Blood pressure trend | Elevated / hypertensive | Normal or low |
| Diuretic response (if given) | Clinical improvement reported | No improvement reported |
| Component typically implicated | Any, often larger-volume red cells | Plasma-containing component (FFP, platelets) |
| Natriuretic peptide (if checked) | Elevated relative to baseline | Not typically elevated |
| Hemolysis workup | Negative | Negative |
Classification Frameworks
Not a WHO disease classification. TACO is tracked as a defined hemovigilance reaction category by national/international hemovigilance systems and AABB-aligned reporting frameworks; exact category codes are institution- and system-specific.
Laboratory Notes
- TACO diagnosis and management (diuresis, oxygen support, rate/volume adjustment) are clinical, not laboratory, responsibilities
- The laboratory's job is workup, documentation review, and applying the correct hemovigilance reporting classification
- Distinguish TACO from TRALI using documentation clues (blood pressure trend, diuretic response, component type), never by inventing a diagnosis at the bench
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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