There is no such thing as the best way to check for hypothyroidism, but you can check for hypothyroidism by taking blood from a vein to check thyroid hormone levels, thyroid iodine uptake rate, and antibody measurements. Once hypothyroidism is detected, prompt medical treatment is needed. Hypothyroidism is generally considered to be present if the blood levels of thyroid hormones are found to be decreased by phlebotomy, and the indicators of hypothyroidism include decreased levels of T3 and T4, and elevated levels of TSH. If the T3 and T4 levels are within the normal range, but the TSH level is elevated, it is called subclinical hypothyroidism. The iodine uptake rate of the thyroid gland in patients with hypothyroidism is significantly lower than normal, often with a low-flat curve; if you suspect that hypothyroidism is caused by autoimmune thyroiditis, you can undergo a measurement of thyroid antibodies, of which the thyroid peroxidase antibody has a high sensitivity and specificity. In addition, when hypothyroidism occurs, its symptoms can be manifested as pale face, facial swelling, indifference and dry skin, etc., the discomfort needs to be actively diagnosed and treated.