Overview
Clinical chemistry instruments quantify analytes using optical, electrochemical, immunochemical, and enzymatic measurement principles, often combined on a single automated platform.
Classification
| Principle | Typical analytes | Common interferences |
|---|---|---|
| Spectrophotometry | Metabolites, many enzymes | Hemolysis, icterus, lipemia |
| ISE potentiometry | Na, K, Cl | Protein buildup, electrode drift |
| Immunoassay | Hormones, markers, drugs | Heterophile Ab, hook effect (method-dependent) |
| Enzymatic | Glucose, enzyme activities | Inhibitors, substrate depletion |
Morphologic Features
Instrument principles reference, not morphologic.
Laboratory Characteristics
- Multi-module analyzers share probes/pipettors across principles
- Calibration and QC are principle- and assay-specific
- Package inserts define measuring range and limitations
Reference Intervals
Reference intervals are method-specific. Changing principle or reagent generation may require interval verification.
Clinical and Laboratory Significance
Selecting an appropriate method principle affects sensitivity, turnaround, and interference profile for clinically actionable results.
Differential Considerations
Differentiate module failure, reagent failure, and specimen interference before broad analyzer downtime.
Comparison Tables
Failure localization
| Question | Photometry cluster fail | ISE cluster fail |
|---|---|---|
| Optics/reagents first? | Yes | No |
| Electrodes/calibration first? | No | Yes |
| Shared probe possible? | Yes if multi-module also failing | Yes if multi-module also failing |
Classification Frameworks
Not applicable.
Laboratory Notes
- Document reagent lot changes when troubleshooting clustered failures
- Confirm water system and cuvette integrity for photometric modules
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.
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