The normal range of TSH is typically between 0.4-4.0 mIU/L (milli-international units per liter).
The normal range of TSH for women is also usually between 0.4-4.0 mIU/L.
TSH levels may be higher in newborns as their thyroid function is not fully developed.
As people age, TSH levels may slightly increase, which does not necessarily indicate hypothyroidism.
TSH levels may decrease during pregnancy, especially in the first trimester, a condition known as gestational hyperthyroidism.
Different laboratories may use different reference ranges, so the normal TSH range may vary slightly.
Conditions like hypothyroidism or hyperthyroidism can cause abnormal TSH levels.