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Thyroid function tests can be abnormal in certain patients in the absence of thyroid
dysfunction. All thyroid function tests can be affected in these patients, including
the free thyroxine assays and free thyroxine index. Familiarity with the conditions
affecting thyroid function tests is necessary to avoid incorrect diagnosis and unnecessary
testing.
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© 1984 Elsevier Inc. Published by Elsevier Inc. All rights reserved.