Overview
Carbohydrate laboratory diagnosis selects and sequences glucose and A1c methods with appropriate matrices to answer screening, diagnostic, and monitoring questions.
Classification
| Choice | Prefer when | Avoid when |
|---|---|---|
| Venous plasma glucose | Diagnostic pathways | Using unvalidated POC instead |
| POC whole blood | Rapid monitoring/triage | Unapproved diagnostic substitution |
| Standardized A1c | Average glycemia pathways | Invalid RBC/hemoglobin context |
| OGTT series | Tolerance assessment | Protocol cannot be completed |
Morphologic Features
Conceptual chemistry reference, morphologic cell identification is hematology, not carbohydrate laboratory diagnosis.
Laboratory Characteristics
- Method menu literacy
- POC governance
- Pathway sequencing
Reference Intervals
Diagnostic glucose/A1c cutoffs and reference intervals are method- and institution-specific. Verify current ADA/institutional criteria and method-specific reference intervals, do not treat textbook examples as universal dogma.
| Concept | Meaning | Notes |
|---|---|---|
| Institutional criteria | Local ADA/guideline adoption | Verify currently |
| Plasma vs whole blood | Different matrices | Not automatically interchangeable |
| Method claims | Analyzer/package insert limits | SOP first |
Clinical and Laboratory Significance
Enables valid application of diabetes and hypoglycemia evaluation frameworks through correct method/matrix selection.
Differential Considerations
True analytic error vs expected matrix difference; monitoring vs diagnostic intent.
Comparison Tables
Plasma vs POC whole-blood glucose
| Feature | Venous plasma | POC whole blood |
|---|---|---|
| Typical diagnostic use | Yes, when claimed | Usually limited |
| Speed | Central TAT | Minutes |
| Interchangeability | Pathway standard | Not automatic |
Classification Frameworks
ADA/WHO diabetes classification frameworks use laboratory criteria, always verify current institutional adoption; do not invent absolute universal cutoffs as dogma.
Laboratory Notes
- Never invent absolute universal method conversion factors as dogma
- Verify current ADA/institutional criteria and method-specific reference intervals
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
- American Diabetes Association. Standards of Care in Diabetes. Diabetes Care (annual update).
- 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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