The normal range of thyroid stimulating hormone is 0.35 to 5.5 μIU/ml, so thyroid stimulating hormone 1.22 μIU/ml is normal. Due to different examination methods and reagents, the reference indexes are different in each hospital and need to be analyzed specifically. Thyrotropin is a hormone secreted by the pituitary gland, which promotes the growth of thyroid cells and the secretion of thyroid hormones. Thyrotropin is regulated by thyrotropin-releasing hormone from the hypothalamus and also by thyroid hormones. Thyrotropin is one of the most sensitive indicators of thyroid function. Free thyroxine and free triiodothyronine are often measured together to diagnose thyroid function. Any abnormal increase or decrease in thyroid stimulating hormone value should be taken seriously and actively consult a doctor for diagnosis and treatment.