Overview
Plasma proteins sit within the Module 7 protein-panel and SPEP pathway. Chemistry reports albumin and total protein; electrophoresis separates albumin, α1, α2, β, and γ fractions.
Classification
| Element | Role | Bench link |
|---|---|---|
| Albumin | Oncotic / transport; SPEP albumin peak | Pair with TP and A/G |
| Globulins | Immune / acute-phase / transport | Calculated = TP − albumin |
| Total protein | Albumin + globulins screen | Volume vs true disorder |
| A/G ratio | Screening clue | Not a stand-alone diagnosis |
| SPEP fractions | Albumin, α1, α2, β, γ | Sharp spike vs broad γ |
| IFE | Types M-protein | Usual reflex after suspected M-spike |
Morphologic Features
Chemistry marker reference, morphologic cell identification is hematology, not protein chemistry framing. SPEP is an electrophoretic pattern, not a smear.
Laboratory Characteristics
- Confirm analyte units and whether globulin/A/G are calculated fields
- Review HIL flags before releasing total protein/albumin
- Note SPEP fraction labels and any M-spike quantitation comments
- Verify institutional reference intervals, not textbook dogma
Reference Intervals
Reference intervals and decision thresholds for protein markers and SPEP fractions are method-, age-, and population-dependent. Verify institutional and method-specific intervals, do not invent absolute universal cutoffs as dogma.
| Parameter | Reporting note | Action |
|---|---|---|
| Albumin / total protein | Method/age/population intervals vary | Verify local RI |
| Calculated globulin / A/G | LIS formula may vary | Confirm calculation practice |
| SPEP fraction % / g/dL | Method (gel vs capillary) matters | Verify local SPEP RI |
| M-spike quant / IFE reflex | Institutional thresholds vary | Verify protocol, no dogma |
Clinical and Laboratory Significance
Abnormal plasma-protein chemistry flags dehydration vs true protein excess/deficit, inflammation, and possible monoclonal protein, chemistry suggests; SPEP/IFE clarifies when indicated.
Differential Considerations
True physiologic change vs preanalytical/analytical artifact vs polyclonal vs monoclonal pattern. Chemistry suggests; SPEP/IFE and clinical correlation decide.
Comparison Tables
Protein panel and SPEP laboratory framing
| Tool | Typical lab clue | Caveat |
|---|---|---|
| TP + albumin | Concentration vs true protein disorder | Volume status / HIL |
| A/G ratio | Screen for SPEP consideration | Not a diagnosis |
| SPEP | Polyclonal vs monoclonal pattern | Method-specific fractions |
| IFE | Isotype of M-protein | Reflex criteria vary |
Classification Frameworks
SPEP/IFE interpretive frameworks and institutional monoclonal workup protocols may guide panel evaluation, always verify current institutional adoption; do not invent absolute universal cutoffs as dogma.
Laboratory Notes
- Never invent absolute universal diagnostic cutoffs as dogma
- Verify institutional and method-specific reference intervals
- Watch dehydration vs true hyperproteinemia and M-spike vs polyclonal patterns
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.
- SPEP / immunofixation and monoclonal protein laboratory interpretation guidance (verify current institutional protocol and any adopted professional society guidance).
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