Overview
The laboratory interface for transfusion monitoring covers the response once a bedside team suspects a transfusion reaction: stopping and preserving the unit, obtaining a new properly identified specimen, performing the immediate clerical recheck, running the core serologic workup, and, when findings warrant, extending the investigation to product-recall or donor-notification pathways. Bedside vital-sign monitoring and clinical reaction management are not covered here; they are clinical (nursing/medical) responsibilities.
Classification
| Workup step | What it checks |
|---|---|
| Clerical/identity recheck | Obvious identity or compatibility error |
| Hemolysis inspection | Visible hemolysis in post- vs. pre-transfusion plasma |
| Repeat ABO/Rh typing | Confirms typing on the post-transfusion specimen |
| Repeat antibody screen | New or missed clinically significant antibody |
| Direct antiglobulin test (DAT) | Antibody/complement coating patient red cells |
Morphologic Features
Not a cell-morphology topic, this is a reaction-investigation workflow reference.
Laboratory Characteristics
- Confirm the transfusion has been stopped before proceeding with investigation
- Preserve the remaining unit and tubing unopened whenever possible for inspection/testing
- Perform the clerical/identity recheck first, it is the fastest way to rule in or out the most dangerous cause
- Assess whether findings implicate the unit/donor broadly, not just the individual patient
Reference Intervals
Not applicable, qualitative investigation workflow. Exact workup panel composition, reflex-testing criteria, and reporting/recall timelines are institution- and regulatory-specific; verify against current SOP and supplier/regulatory requirements.
Clinical and Laboratory Significance
The reaction workup differentiates a hemolytic process (identity/compatibility error, unexpected antibody) from non-hemolytic reaction categories (febrile non-hemolytic, allergic, septic/contamination, other), which changes both the urgency of the response and whether other units or patients need to be evaluated.
Differential Considerations
Distinguish a single-patient antibody-related reaction (investigation stays with this patient) from a unit- or process-level problem such as bacterial contamination or an identity error affecting other units (investigation broadens to related units/patients).
Comparison Tables
Reaction workup findings and required response
| Workup finding | Required laboratory response |
|---|---|
| Clerical/ABO discrepancy found | Immediate notification; broaden investigation to other potentially affected units |
| Positive DAT or visible hemolysis, clerical check clean | Continue serologic workup; notify clinical team of findings |
| Suspected bacterial contamination | Quarantine related units; notify supplier per protocol |
| All workup findings negative/unremarkable | Document; support continued clinical evaluation of other reaction causes |
Classification Frameworks
Not applicable, laboratory reaction-investigation workflow, not a WHO disease classification.
Laboratory Notes
- Clerical/identity recheck always precedes the serologic workup
- Ask whether a finding is patient-specific or unit/process-level before closing the investigation
- Recall and donor-notification pathways are laboratory/medical-director responsibilities, not bedside-managed
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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