The use of the Thyroid Peroxidase Antibodies is used for a differential diagnosis of hypothyroidism and thyroiditis.
Reference Interval:
|
Age
|
(IU/mL)
|
|
0-3 d
|
0-9
|
|
4-30 d
|
0-26
|
|
31 d to 12 mo
|
0-13
|
|
13 mo to 5 y
|
0-20
|
|
6-10 y
|
0-21
|
|
11-19 y
|
0-20
|
|
>19 y
|
0-34
|
Other Information & Limitations
This assay should be used in conjunction with anti-thyroglobulin test, since autoimmune thyroiditis may demonstrate a response to antigens other than thyroid microsomes. Other autoimmune disorders such as Sjögren's syndrome, lupus erythematosus, rheumatoid arthritis, pernicious anemia, and others may be positive for antimicrosomal and antithyroglobulin. Patients with myxedema, granulomatous thyroiditis, nontoxic nodular goiter, and thyroid carcinoma may occasionally produce thyroid antibodies.
Antibodies to thyroid microsomes (thyroid peroxidase) are present in 70% to 90% of patients with chronic thyroiditis. They are also present in smaller percentages of patients of other thyroid diseases. Antibody production may be confined to lymphocytes within the thyroid, and serum may be negative. Small numbers (3%) of people with no evidence of disease may have antibody. This is more frequent in females and increases with age.