A pituitary hormone used as the primary screening test for thyroid function.
Also known as: thyroid-stimulating hormone
Thyroid-stimulating hormone (TSH) is released by the pituitary gland to regulate the thyroid. It is the usual first-line test for an underactive or overactive thyroid.
Thyroid problems can produce symptoms that overlap with perimenopause, so TSH is often checked when evaluating fatigue, weight change, or menstrual changes.