TSHhormones
Thyroid Stimulating Hormone
Checks how well your thyroid gland is working.
What it measures
The level of thyroid-stimulating hormone from the pituitary gland.
Why it is ordered
To detect an underactive or overactive thyroid.
How to prepare
No fasting required; take at a consistent time if on thyroid medicine.
What happens during the test
A blood sample is drawn from a vein.
Normal ranges
| Group | Normal range |
|---|---|
| Adult | 0.4 – 4 mIU/L |
Ranges vary slightly between laboratories.
What abnormal results may mean
High TSH suggests an underactive thyroid; low TSH suggests an overactive thyroid.
Related conditions: Hypothyroidism, Hyperthyroidism
Related tests: Thyroid Profile (T3/T4)
⚠️ Important: Abnormal results do not mean you have a disease. Always discuss your results with your doctor.