The TSH test is routinely performed in several scenarios:
* When hypothyroidism (underactive thyroid) is suspected, indicated by symptoms such as rapid weight gain, hair loss, and cold intolerance.
* When hyperthyroidism (overactive thyroid) is suspected, indicated by symptoms like sudden weight loss, insomnia, tremors, sweating, and heart palpitations.
* For monitoring patients undergoing treatment for an underactive thyroid.
* For monitoring patients undergoing treatment for an overactive thyroid.
* As a routine screening for newborns to assess thyroid gland function.