A decrease in total and unbound T3 levels with normal levels of T4 and TSH indicates

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Sick euthyroid syndrome, also known as non-thyroidal illness syndrome, is characterized by abnormal findings on thyroid function tests that occur in the setting of a non-thyroidal illness, without preexisting hypothalamic-pituitary and thyroid gland dysfunction. It often presents with low T3 levels, while T4 and TSH may remain within normal ranges, especially in the early stages.

A Decrease in Total and Unbound T3 Levels with Normal