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HelpTest Code TSH Thyroid Stimulating Hormone (TSH)
Laboratory Code
LAB129
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0mL
Minimum Volume: 0.5mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 24 hours |
| Refrigerate | 7 days |
| Frozen | 6 months |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Reference Interval
| Age | |
|---|---|
| 4 days – 5 mths | 0.73 – 4.77 mIU/L |
| 6 mths – 13 yrs | 0.70 – 4.17 mIU/L |
| 14 yrs – 18 yrs | 0.47 – 3.41 mIU/L |
| ≥ 19 yrs | 0.35 – 4.94 mIU/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Diagnosis of hyperthyroidism and hypothyroidism.
Monitor thyroxine replacement or suppression therapy.
Distinguish non-thyroidal illness (NTI) from hyperthyroidism.
Service Code
31622
LOINC Code Information
11580-8
Update
Last updated 13/03/2025