When testing thyroid function in clinical practice, the commonly used indicator is anti-thyroid peroxidase antibody (TPOAb), the normal range of which is <60 IU/ml. However, due to the different methods and reagents used in the test, the reference indexes vary from hospital to hospital, so it is necessary to consult a doctor. Determination of anti-thyroid peroxidase antibody is helpful to assist in the diagnosis of thyroid-related autoimmune diseases, such as chronic lymphocytic thyroiditis and Graves' disease. The normal range of TPOAb is usually less than 60IU/ml. When the concentration of TPOAb is elevated, it is a positive result, and it is necessary to test other indexes of thyroid function tests at the same time to diagnose thyroid-related diseases. It is recommended to go to a regular hospital for examination.