Overview
Packed red blood cells (PRBCs) are prepared by removing most of the plasma (and, depending on processing, platelets) from a whole blood collection, leaving a concentrated red cell product. An additive solution is commonly used to support red cell metabolism during extended refrigerated storage.
Classification
| Preparation element | Laboratory-relevant note |
|---|---|
| Plasma removal | Most plasma diverted to FFP/other plasma products |
| Additive solution | Institution/product-specific formulation supporting storage viability |
| Leukoreduction (optional) | Reduces white cell content per institutional process |
Morphologic Features
Not a cell-morphology topic in the microscopic sense. Relevant visual findings are macroscopic: plasma-layer color/clarity in the tubing segment, presence of clots, and bag/tubing integrity.
Laboratory Characteristics
- Visual inspection at release and at any reissue: plasma-layer color (watch for pink/red/brown discoloration suggesting hemolysis), clarity, clots, particulate matter, bag/tubing integrity
- Returned units require documented time-out-of-monitored-storage history plus a fresh visual inspection before reissue
- Any positive inspection finding or incomplete storage-time documentation is a quarantine/escalate decision, not a judgment call
Reference Intervals
No diagnostic reference interval applies. Storage temperature range, dating period, and additive-solution formulation are institution- and product-specific, verify current values against SOP and current AABB/FDA-recognized standards rather than citing a fixed universal figure.
Clinical and Laboratory Significance
PRBCs are not a diagnostic test; they are a transfusable product used to restore oxygen-carrying capacity. Laboratory significance centers on storage-integrity verification, identity/label checks, and visual-inspection release criteria rather than an interpretive result.
Differential Considerations
Not applicable in the diagnostic sense. The relevant laboratory distinction is product identity: PRBCs (plasma-reduced red cells) vs whole blood (unseparated) vs washed/frozen or irradiated red cell variants, each governed by its own preparation history and SOP.
Comparison Tables
PRBC release/reissue-decision framing
| Finding at inspection | Laboratory action |
|---|---|
| Pink/red/brown plasma-layer discoloration | Do not issue/reissue; quarantine and evaluate for hemolysis |
| Visible clots or particulate matter | Do not issue; quarantine and evaluate |
| Bag/tubing damage or compromised seal | Do not issue; quarantine and evaluate |
| Incomplete time-out-of-storage documentation on return | Do not reissue until documentation is resolved per SOP |
Classification Frameworks
Not applicable, laboratory blood product, not a WHO disease classification.
Laboratory Notes
- Dating status alone is never sufficient to justify reissue, storage-time documentation and re-inspection are both required
- Clinical urgency changes how quickly a suitable replacement unit is sourced, it does not authorize reissuing a unit with a positive inspection finding
- Storage-lesion changes are managed through validated storage and dating adherence, not through any bedside 'fix'
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).
- U.S. Food and Drug Administration. Code of Federal Regulations Title 21 . Blood and Blood Components (verify current institutional adoption).
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