Overview
Blood collection establishes specimen identity and quality through patient identification, CLSI GP41-aligned venipuncture, immediate labeling, correct fill, and gentle mixing. Valid chemistry results require the correct patient, specimen, matrix, container, processing conditions, and documented chain from collection through analysis.
Classification
| Category | Key characteristic | Bench implication |
|---|---|---|
| Identity | Patient and tube match | No relabeling by assumption |
| Collection site | Avoid contamination and tissue trauma | Document line draws |
| Tube fill | Correct additive-to-blood relationship | Check minimum volume |
| Mixing | Additive dispersed without cell injury | Do not shake |
Morphologic Features
Preanalytical reference, morphologic cell identification is hematology, not clinical chemistry specimen handling.
Laboratory Characteristics
- Inspect identity, container, volume, and visible integrity before analysis
- Verify clotting, mixing, centrifugation, time, and temperature requirements
- Apply H-index/L-index/I-index and rejection rules by assay and SOP
Reference Intervals
Numeric HIL cutoffs, clotting times, centrifuge settings, and stability windows are method- and institution-specific. Verify against local SOP and package inserts, do not treat textbook examples as universal critical limits.
| Concept | Meaning | Notes |
|---|---|---|
| Institutional threshold | SOP/method-defined acceptability limit | Verify locally |
| H / L / I index | Hemolysis / lipemia / icterus interference flags | Assay-specific |
| Stability window | Time/temperature for valid analysis | Analyte- and matrix-specific |
Clinical and Laboratory Significance
A mislabeled or compromised draw can assign another patient's chemistry values, create dilution from IV fluid, or produce spurious potassium and enzyme results. A preanalytical failure can create a misleading chemistry pattern and must be resolved before diagnostic interpretation.
Differential Considerations
Differentiate true patient change from wrong matrix, additive carryover, cellular leakage, contamination, delayed separation, or optical interference.
Comparison Tables
Controlled versus compromised chemistry blood collection
| Feature | Controlled collection | Compromised collection |
|---|---|---|
| Labeling | At bedside | Absent or remote |
| Fill/mixing | Tube instructions met | Underfilled or shaken |
| Disposition | Process normally | Evaluate/recollect per SOP |
Classification Frameworks
WHO disease classifications are not the primary framework for preanalytical chemistry specimen terminology.
Laboratory Notes
- Use CLSI GP41 for venous blood collection practice and local policy for implementation
- Never create a missing patient-specimen link after the specimen leaves the bedside
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
- Rifai N, Horvath AR, Wittwer CT, eds. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 8th ed. Elsevier; 2022.
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Bishop ML, Fody EP, Schoeff LE. Clinical Chemistry: Principles, Techniques, and Correlations. 9th ed. Jones & Bartlett; 2022.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Collection of Diagnostic Venous Blood Specimens. CLSI standard GP41. CLSI.
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
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