Thyroid Microsomal (ATM) Antibodies, Serum


This test is used in the diagnosis of Hashimoto’s thyroiditis. Other autoimmune disorders such as Sjogren’s syndrome, lupus erythematosus, rheumatoid arthritis, pernicious anemia and others may also be positive for anti-microsomal and anti-thyroglobulin antibodies. Patients with myxedema, granulomatous thyroiditis, non-toxic nodular goiter and thyroid carcinoma may also occasionally produce other thyroid antibodies.


Frequency of positive results in thyroid autoimmune disease is higher than in the anti-thyroglobulin antibodies test, especially in people less than 20 yrs of age. This test should be used in conjunction with antithyroglobulin test, since autoimmune thyroiditis may demonstrate a response to antigens other than thyroid microsomes. See Also Thyroiglobulin Antibodies and Thyroid Peroxidase Antibodies

Sample Type, Quantity & Conditions

1 ml Serum Frozen

Special Precautions

Normal Range

< 1:100 Titre

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