Name |
Immunoglobulin G (IgG) |
Alternative name/Profile |
IgG, GAM, ELEC, Serum Protein Electrophoresis (SPEP), Multiple Myeloma (MM), Bence Jones Protein (BJP), Free light chains, FKFL, IgG, IgA, IgM, IgD, FKC, FLC, Immunoglobulins, Paraprotein, Monoclonal Gammopathy of Unknown Significance (MGUS) |
Department |
Immunology |
Investigation |
Turbidimetry (Roche Cobas c 303) |
Specimen type |
Clotted blood
|
Sample type |
Serum |
Sample container & volume |
5ml Red. |
Frequency of analysis |
Daily Monday to Friday |
Turnaround time |
7 days
|
Availability |
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Notes |
Useful for:
- Detecting and monitoring monoclonal gammopathies
- Detecting and monitoring immunodeficienies
Clinical Information:
- Immunoglobulin G (IgG) represents about 80% of normal serum immunoglobulin.
- Levels of IgG may be raised due to a polyclonal production of antibody in reponce to infection, hepatic disease or a connective tissue disease. Elevated levels of IgG can also be due to a monoclonal production of antibody. Monoclonal production of IgG antibody is a characteristic of Multiple Myeloma or a Monoclonal Gammopathy of Unknown Significance (MGUS).
- Decreased levels of IgG are found in patients with both primary and secondary immunodeficiencies.
Please note:
- As electrophoresis is required to distinguish monoclonal from polyclonal IgG production, all samples for IgG levels also have electrophoresis performed.
- As a monoclonal production of another immunoglobulin may cause a secondary immunodeficiency of IgG, all requests for IgG levels also have IgA and IgM levels measured.
- IgG levels should not be used to monitor a monoclonal protein as there may be background polyclonal IgG. Therefore electrophoreseis is used as a tool to monitor monoclonal proteins.
- Where External Institiutions cannot guarantee immediate delivery, samples must be centrifuged, separated and stored at 4oC. Samples can then be transported, as soon as possible, to St. James's Hospital for processing.
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Related links |
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Reference range |
| Age |
IgG (g/L) |
IgA (g/L) |
IgM (g/L) |
| 0-2 Weeks |
5-17 |
0.01-0.08 |
0.05-0.22 |
| 2-6 Weeks |
3.9-13 |
0.02-0.15 |
0.08-0.4 |
| 6-12 Weeks |
2.1-7.7 |
0.05-0.40 |
0.15-0.7 |
| 3-6 Months |
2.4-8.8 |
0.10-0.5 |
0.2-1 |
| 6-9 Months |
3-9 |
0.15-0.7 |
0.4-1.6 |
| 9-12 Months |
3-10.9 |
0.2-0.7 |
0.6-2.1 |
| 1-2 Years |
3.1-13.8 |
0.3-1.2 |
0.5-2.2 |
| 2-3 Years |
3.7-15.8 |
0.3-1.3 |
0.5-2.2 |
| 3-6 Years |
4.9-16.1 |
0.4-2 |
0.5-2 |
| 6-9 Years |
5.4-16.1 |
0.5-2.4 |
0.5-1.8 |
| 9-12 Years |
5.4-16.1 |
0.7-2.5 |
0.5-1.8 |
| 12-15 Years |
5.4-16.1 |
0.8-2.8 |
0.5-1.9 |
| Adult |
6.26-14.96 |
0.62-2.9 |
0.47-1.82 |
Adult reference ranges validated in-house 2009.
Age-Related Reference Ranges sourced from the Protein Reference Unit, Sheffield and last updated 2007.
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Last updated |
Mon, 23 Sep 2024 08:16:17 IST |
