My thyroid test results are T3 = 132, T4 = 10, and TSH = 1.63, which are all within the normal range, but my doctor still suggested starting thyroxine 50 mcg. Why was this prescribed?
Although your thyroid values are normal, doctors may prescribe thyroxine 50 mcg if you have hypothyroid symptoms (fatigue, weight gain, hair fall, depression), if you are planning pregnancy or undergoing fertility treatment (where TSH is ideally kept around 1–2), in cases of thyroid enlargement or nodules, borderline thyroid function, or a history of thyroid disease; in such cases, the decision is based on your symptoms and overall health rather than lab numbers alone, so it’s best to confirm with your doctor the exact reason for treatment in your situation.