Test Information:
TSH serves as the initial test to assess thyroid function. In case of high levels of TSH, free thyroxine (fT4) measurements are performed to determine the degree of hypothyroidism. When low levels of TSH are measured, fT4 and free triiodothyronine (fT3) measurements are performed to determine the degree of hyperthyroidism. TSH measurements are particularly suitable for early detection or exclusion of disorders in the central regulating circuit between the hypothalamus, pituitary and thyroid. In case of suspected pituitary or hypothalamic disease, TSH levels are measured together with fT4 levels to confirm diagnosis.
Specimen Container:
Gold Top SST Tube (with clot activator) or Red Top Tube (Plain)
Specimen Type:
Serum
Required Volume:
2 mL
Patient Preparation:
No Patient Preparation
Notes:
N/A (Not Applicable)
Storage & Stability
(Before Processing)
- Storage: 2 to 8°C
Stability: 14 days - Storage: 20 to 25°C
Stability: 8 days - Storage: – 20°C
Stability: 24 months
FREEZE ONLY ONCE!
Transport Temperature:
Ref (2˚C – 8˚C)
Test Category:
Routine
Test Schedule:
Daily
Results Availability:
Within 4 hours