A normal TSH level
Normal TSH (thyroid-stimulating hormone) blood level
A normal TSH is 0.5 – 5.0 mU/L.
TSH is the most important thyroid test. But it has to be interpreted with other thyroid tests including thyroxine (T4), triiodothyronine (T3) and thyroid antibodies.
Explanation
- High or low TSH levels can indicate a thyroid problem
- What do abnormal TSH levels mean?
- A low TSH indicates an overactive thyroid gland (hyperthyroidism)
- A high TSH indicates an underactive thyroid gland (hypothyroidism).
Note. TSH levels can vary depending on the laboratory that tested the sample; and other factors, including age, gender, medication and pregnancy.
