Overview
Clinical chemistry is the laboratory discipline that quantifies chemical constituents of body fluids to support diagnosis, monitoring, and therapy. It emphasizes analytical validity, reference intervals, and critical-value communication.
Classification
| Family | Examples | Section ownership |
|---|---|---|
| Electrolytes | Na, K, Cl, HCO₃ | Clinical chemistry |
| Metabolites | Glucose, urea, creatinine | Clinical chemistry |
| Enzymes | AST, ALT, CK, lipase | Clinical chemistry |
| Cell counts | WBC, RBC, platelets | Hematology |
| Coagulation times | PT, aPTT | Hemostasis/coagulation |
Morphologic Features
Scope reference, morphologic cell identification is hematology, not clinical chemistry.
Laboratory Characteristics
- Organized by analyte menus and analyzer modules
- Results expressed as concentrations or activities with units
- QC, calibration, and method verification underpin release
Reference Intervals
Reference intervals are method-, population-, and institution-specific. Establish and verify per CLSI EP28 framework and local policy.
| Concept | Meaning | Notes |
|---|---|---|
| Reference interval | Expected values in a defined reference population | Not a diagnostic cutoff by itself |
| Critical value | Result requiring immediate clinician notification | Thresholds are institutional |
| Units | SI or conventional | Verify LIS display and conversion factors |
Clinical and Laboratory Significance
Chemistry patterns suggest organ-system involvement and metabolic status. Disease labeling requires clinical correlation beyond a single result.
Differential Considerations
At scope level, distinguish section-ownership and order-entry errors from true analyte abnormalities before assigning disease labels.
Comparison Tables
Chemistry vs hematology
| Feature | Clinical chemistry | Hematology |
|---|---|---|
| Primary measurand | Chemical analytes | Cells and morphology |
| Typical specimen | Serum/plasma | EDTA whole blood |
| Core output | Concentrations/activities | Counts, indices, smear |
Classification Frameworks
WHO disease classifications are not the primary framework for introductory chemistry scope terminology.
Laboratory Notes
- Confirm panel membership in the local LIS before teaching “universal” panel contents
- Route specialty markers per institutional menu ownership
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. Defining, Establishing, and Verifying Reference Intervals in the Clinical Laboratory; Approved Standard. CLSI document EP28-A3c. CLSI; 2010.
- Clinical and Laboratory Standards Institute. Collection of Diagnostic Venous Blood Specimens. CLSI standard GP41. CLSI.
Frequently Asked Questions
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What is the Clinical Chemistry . Scope laboratory reference?
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