Chin Kek Peng, Pin Yeo Chin
Department of Endocrinology, Singapore General Hospital, Singapore.
Intern Med. 2008;47(23):2033-7. doi: 10.2169/internalmedicine.47.1496. Epub 2008 Dec 1.
Immunoassays are one of the main methods of measuring thyroid hormones. They are prone to interference. Interference of the immunoassays has been increasingly recognized as a problem because it may lead to misinterpretation of results resulting in unnecessary investigation and wrong course of treatment. We describe a patient who had interference in her thyroid function measurements (free T4, free T3 and TSH) during the course of treatment for Graves' disease.
