Overview
Fasting blood sugar (fasting plasma glucose) is glucose measured after a verified fasting interval, typically in venous plasma, and used within diabetes diagnostic frameworks.
Classification
| Element | Requirement | Action if failed |
|---|---|---|
| Fasting interval | Per institutional policy | Reschedule/document |
| Matrix | Usually plasma | Correct tube/method |
| Processing | Timely separation | Follow glycolysis prevention SOP |
| Interpretation | ADA/institutional pathway | Verify current cutoffs |
Morphologic Features
Conceptual chemistry reference, morphologic cell identification is hematology, not carbohydrate laboratory diagnosis.
Laboratory Characteristics
- Preparation check at bedside
- Plasma method claims for diagnostic use
- Confirmation testing often required, follow local policy
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
FPG is one accepted pathway for diabetes/prediabetes classification when preparation and matrix are valid, verify current criteria locally.
Differential Considerations
Non-fasting elevation, stress hyperglycemia, and delayed-processing artifact vs true fasting hyperglycemia.
Comparison Tables
Valid vs invalid fasting glucose collection
| Feature | Valid FPG | Invalid/non-fasting |
|---|---|---|
| Preparation | Verified fasting | Recent caloric intake |
| Labeling | FPG appropriate | Do not label as fasting |
| Use in pathways | May apply diagnostic frameworks | Use random/casual framing instead |
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 FPG cutoffs 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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