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HelpTest Code IGG4 Immunoglobulin Subclass IgG4, serum
Laboratory Code
LAB2205
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 6 days (preferred) |
| Frozen | 6 months |
Methodology
Turbidimetry
Days and Times Performed
Thursdays, TAT 2 - 8 days
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
| Age | |
|---|---|
| < 5 yrs | < 0.5 g/L |
| 5 – < 10 yrs | < 0.8 g/L |
| 10 - < 15 yrs | < 1.0 g/L |
| 15 - < 16 yrs | < 1.1 g/L |
| ≥ 16 yrs | < 1.3 g/L |
Note:
IgG4 may be falsely increased in grossly lipaemic samples.
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724399
Useful For
Supporting the diagnosis of IgG4-related disease.
Service Code
36912
LOINC Code Information
2469-5
Update
Last updated 30/09/2025