Overview
Whole blood is a donor collection that has not been separated into individual components, red cells, plasma, platelets, and white cells remain together with an anticoagulant/preservative solution added at collection. Some transfusion services store and issue whole blood as a standalone product (e.g., low-titer group O whole blood programs); most collections are otherwise processed into separated components.
Classification
| Element present | Laboratory-relevant behavior in stored whole blood |
|---|---|
| Red cells | Viability preserved across the labeled dating period under validated refrigeration |
| Plasma / coagulation factors | Present; labile factor activity declines with storage time |
| Platelets | Present; functional viability declines rapidly under refrigeration |
| White cells | Present unless leukoreduced per institutional process |
Morphologic Features
Not a cell-morphology topic. Relevant visual findings are macroscopic: unit color, clarity, presence of clots, and container/tubing integrity assessed at inspection.
Laboratory Characteristics
- Must remain in validated, continuously monitored, alarmed refrigerated storage for its entire history
- Any storage excursion (including a non-validated refrigerator) requires documented evaluation before the unit can be considered for release
- Visual inspection before storage, transport, or issue: check for clots, discoloration/hemolysis, cloudiness, particulate matter, and bag/tubing damage
- Identity check: unit number, ABO/Rh, expiration, and special attributes verified against records before issue
Reference Intervals
No diagnostic reference interval applies. Storage temperature range, dating period, and anticoagulant/additive-solution specifics 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
Whole blood is not a diagnostic test; it is a transfusable product. Its laboratory significance lies in storage-integrity verification, correct labeling/identity, and visual-inspection release criteria rather than in an interpretive result.
Differential Considerations
Not applicable in the diagnostic sense. The relevant laboratory distinction is product identity: whole blood (unseparated) vs packed red blood cells (red cells after plasma/platelets removed) vs a reconstituted mixture of separated components, each has a distinct preparation history and SOP.
Comparison Tables
Whole blood release-decision framing
| Finding at inspection | Laboratory action |
|---|---|
| Unit found in non-validated/non-monitored refrigerator | Treat as a storage excursion; quarantine and evaluate per SOP, do not release on appearance alone |
| Visible clots, cloudiness, or discoloration | Do not issue; quarantine and evaluate |
| Bag/tubing damage or compromised seal | Do not issue; quarantine and evaluate |
| Identity/label mismatch against records | Do not issue; resolve discrepancy before any further action |
Classification Frameworks
Not applicable, laboratory blood product, not a WHO disease classification.
Laboratory Notes
- Validated, continuously monitored, alarmed refrigeration is the standard, a general-purpose cold refrigerator is not an acceptable substitute, even briefly
- Clinical urgency does not authorize releasing a unit of unconfirmed storage integrity
- Platelet function in refrigerated whole blood is not expected to remain reliable, do not treat whole blood as equivalent to a dedicated platelet product
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).
Frequently Asked Questions
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