Thyroid testing involves both a blood test and an ultrasound. Thyroid blood test is mainly to judge the status of thyroid function, to see whether the thyroid function is normal, hyperthyroidism or hypothyroidism. In addition, it is mainly to determine whether it is now mainly active or not, and at the same time, it is to further clarify the etiology of the diagnosis. And thyroid ultrasound, on the one hand, is to clarify the nature of the thyroid gland, but also to clarify the nature and etiology of some of the thyroid nodules. So for some people, especially patients with thyroid nodules, we need to refer to both the results of thyroid ultrasound and also the results of thyroid function, and combine them together in order to give the patient a clear diagnosis.