Overview
Preanalytical variables affect CBC results before analysis. Mitigation follows institutional specimen handling SOP.
Classification
Preanalytical categories
| Category | Examples | Typical CBC effect |
|---|---|---|
| Patient | Age, sex, pregnancy, altitude, exercise | Shifts reference interval interpretation |
| Collection | Hemolysis, clot, underfill, tourniquet | Spurious Hb, MCV, PLT changes |
| Transport | Delay, temperature extremes | Cell degradation, inaccurate counts |
| Identification | Mislabel, wrong tube | Patient safety, reject |
Morphologic Features
Visual tube inspection before analysis, clots, hemolysis, fill level.
Laboratory Characteristics
- Reject criteria, per institutional policy
- Stability window, analyzer and temperature dependent
- Capillary vs venous, validate pediatric workflows locally
Reference Intervals
This table does not list universal numeric reference intervals. Verify all intervals on the patient report (CLSI EP28-A3c).
Clinical and Laboratory Significance
Preanalytical errors mimic disease patterns, exclude before pathologic interpretation.
Differential Considerations
Not applicable, preanalytics reference only.
Comparison Tables
Mitigation quick reference
| Artifact | Action |
|---|---|
| Clot | Reject, recollect |
| Hemolysis | Reject or comment per policy |
| Underfill EDTA | Reject or recollect . MCV/PLT artifact risk |
| PLT clump | Smear; citrate recollection per protocol |
Classification Frameworks
Not applicable.
Laboratory Notes
- Demographic factors alter reference intervals, use report-specific intervals only.
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
- McPherson RA, Pincus MR. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Elsevier; 2021.
- Rodak BF, Carr JH. Rodak's Hematology: Clinical Principles and Applications. 6th ed. Elsevier; 2020.
- McKenzie SB, Williams JL. Clinical Laboratory Hematology. 4th ed. Pearson; 2022.
Professional Monographs
- Barnes PW, McFadden SL, Machin SJ, Doig K. Laboratory Hematology Practice. Wiley-Blackwell; 2012.
CLSI and Professional Guidelines
- Clinical and Laboratory Standards Institute. Reference Leukocyte (WBC) Differential Count (Proportional) and Evaluation of Instrumental Methods; Approved Standard. CLSI document H20-A2. CLSI; 2007.
- Clinical and Laboratory Standards Institute. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
- Clinical and Laboratory Standards Institute. Management of Critical- and Significant-Risk Results. CLSI guideline GP47-Ed1. CLSI; 2015.
Frequently Asked Questions
Common questions about using this CBC Preanalytical Variables . Reference additional test references Medical Laboratory Library reference in Medical Laboratory Science education.
What is the CBC Preanalytical Variables . Reference laboratory reference?
CBC Preanalytical Variables . Reference is a Additional Test References entry in the LabPedia Medical Laboratory Library, written for Medical Laboratory Science reference lookup.
How should students use this medical laboratory encyclopedia page?
Read the structured sections for quick orientation, then follow related links into Academy lessons or Challenge Center practice when you need teaching or assessment.
Does this page replace laboratory textbooks?
No. It is a concise educational laboratory reference. Use recognized laboratory medicine sources and your institutional procedures for definitive practice decisions.
Where can I find related laboratory tests?
Use related links on this page when present, or browse Laboratory Library discipline catalogues for laboratory tests and interpretation references.
Is this content part of Medical Laboratory Education on LabPedia?
Yes. Library references support Medical Laboratory Education alongside Academy courses, medical laboratory quizzes, and laboratory case studies.
Can reference details vary between laboratories?
Yes. Methods, intervals, and reporting conventions vary. Always confirm details against your laboratory’s current protocols.
How do I return to Library search or categories?
Use breadcrumbs to open the Library hub, discipline catalogues, or other reference collections for continued medical laboratory resource browsing.