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HelpTest Code IgG4 Immunoglobulin Subclass IgG4, serum
Additional Codes
| Epic Ordering Code | LAB2205 |
| NBS code | LBC06948 |
| Service code | 36912 |
Specimen Requirements
Submit the following:
| Container: |
| Yellow Top |
Processing Requirements
Allow specimen to clot for 30 mins and centrifuge within 2 hours
Specimen type: Serum
Volume: 0.5mL
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 6 days (preferred) |
| Frozen | 6 months |
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | Alert/Reject |
| Others | Not applicable |
Methodology
Turbidimetry
Days and Times Performed
Thursdays, TAT 2 - 8 days
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.
Update
Last updated 25/08/2026
LOINC Code Information
2469-5