General Information About the Test
Test Process and Preparation
It works on a reverse logic: If the thyroid gland becomes sluggish and produces too few hormones, the brain increases TSH secretion to whip (stimulate) it more. That is, a high TSH is actually an indicator that the thyroid gland is underactive (Hypothyroidism). It causes weight gain, fatigue, and a feeling of being cold.
If the thyroid gland goes out of control and produces excessive hormones (T3, T4), the brain realizes there is no need for stimulation and stops TSH production. That is, a low TSH means the thyroid is overactive (Hyperthyroidism). It causes palpitations, sweating, and weight loss.
If you are currently taking thyroid medication, you should come to give blood in the morning without taking your medication (on an empty stomach) and you should take your medication immediately after giving your blood.
The information on this page is for informational purposes only. The results of medical tests must be evaluated by specialist physicians.
