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HelpTest ID: IGA Immunoglobulin A (IgA), Serum
Reporting Name
Immunoglobulin A (IgA), SUseful For
Detection or monitoring of IgA monoclonal gammopathies and IgA-related immune deficiencies
Clinical Information
The gamma globulin band as seen in conventional serum protein electrophoresis consists of 5 immunoglobulins. In normal serum, about 15% is immunoglobulin A (IgA).
Monoclonal gammopathies of all types may lead to a spike in the gamma globulin zone seen on serum protein electrophoresis.
Monoclonal elevations of IgA characterize multiple myeloma.
Decreased immunoglobulin levels are found in patients with congenital deficiencies.
Interpretation
Increased serum immunoglobulin concentrations occur due to polyclonal or oligoclonal immunoglobulin proliferation in hepatic disease (hepatitis, liver cirrhosis), connective tissue diseases, acute and chronic infections, as well as in the cord blood of neonates with intrauterine and perinatal infections.
Elevation of immunoglobulin A may occur in monoclonal gammopathies such as multiple myeloma, primary systemic amyloidosis, monoclonal gammopathy of undetermined significance, and related disorders.
Decreased levels are found in patients with primary or secondary immune deficiencies.
Testing Algorithm
The following algorithms are available in Special Instructions:
-Celiac Disease Comprehensive Cascade
-Celiac Disease Diagnostic Testing Algorithm
-Celiac Disease Gluten-Free Cascade
Report Available
1 to 3 daysDay(s) Performed
Monday through Friday
Clinical Reference
1. Webster ADB: Laboratory investigation of primary deficiency of the lymphoid system. In Clinics in Immunology and Allergy. Vol 5. Third edition. Philadelphia, WB Saunders Company, 1985, pp 447-468
2. Pinching AJ: Laboratory investigation of secondary immunodeficiency. In Clinics in Immunology and Allergy. Vol 5. Third edition. Philadelphia, WB Saunders Company, 1985, pp 469-490
3. Dispenzieri A, Gertz MA, Kyle RA: Distribution of diseases associated with moderate polyclonal gammopathy in patients seen at Mayo Clinic during 1991. Blood 1997;90:353
4. Kyle RA, Greipp PR: The laboratory investigation of monoclonal gammopathies. Mayo Clin Proc 1978;53:719-739
5. Ballow M, O'Neil KM: Approach to the patient with recurrent infections. In Allergy: Principles and Practice. Vol 2. Fourth edition. Edited by E Middleton Jr, CE Reed, EF Ellis, et al. St. Louis, MO, Mosby-Year Book, Inc, 1993, pp 1027-1058
6. Kyle RA: Detection of quantitation of monoclonal proteins. Clin Immunol Newsletter 1990;10:84-86
Method Name
Nephelometry
Specimen Type
SerumOrdering Guidance
Cascade testing is recommended for celiac disease. Cascade testing ensures that testing proceeds in an algorithmic fashion. The following cascades are available; select the appropriate one for your specific patient situation.
-CDCOM / Celiac Disease Comprehensive Cascade: complete testing including HLA DQ
-CDSP / Celiac Disease Serology Cascade: complete testing excluding HLA DQ
-CDGF / Celiac Disease Gluten-Free Cascade: for patients already adhering to a gluten-free diet
To order individual tests, see Celiac Disease Diagnostic Testing Algorithm in Special Instructions.
Specimen Required
Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Specimen Volume: 1 mL
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 28 days | |
| Frozen | 28 days | ||
| Ambient | 14 days |
Special Instructions
Reference Values
0-<5 months: 7-37 mg/dL
5-<9 months: 16-50 mg/dL
9-<15 months: 27-66 mg/dL
15-<24 months: 36-79 mg/dL
2-<4 years: 27-246 mg/dL
4-<7 years: 29-256 mg/dL
7-<10 years: 34-274 mg/dL
10-<13 years: 42-295 mg/dL
13-<16 years: 52-319 mg/dL
16-<18 years: 60-337 mg/dL
≥18 years: 61-356 mg/dL
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
82784
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| IGA | Immunoglobulin A (IgA), S | 2458-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| IGA | Immunoglobulin A (IgA), S | 2458-8 |
Forms
If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Client Test Request (T728) with the specimen.
mml-Movement-Disorders, mml-Neuroimmunology, mml-Neuromuscular, mml-Autonomic, mml-Pediatric, mml-Spinal-Cord