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 the majority of cases however the TSH level is within the normal range (inappropriately normal given the low thyroxine and T3).
Changes are reversible upon recovery from the systemic illness.
Changes are reversible upon recovery from the systemic illness.