Endocrinology · Pathway 17

Sick Euthyroid Syndrome

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Key points

Sick euthyroid syndrome In sick euthyroid syndrome (now referred to as non-thyroidal illness) it is often said that everything (TSH, thyroxine and T3) is low.
In sick euthyroid syndrome (now referred to as non-thyroidal illness) it is
often said that everything (TSH, thyroxine and T3) is low. In the majority
of cases however the TSH level is within the >normal range
(inappropriately normal given the low thyroxine and T3).