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Low T3 Syndrome Recognition

Meaning

Low T3 Syndrome Recognition, also known as Euthyroid Sick Syndrome or Non-Thyroidal Illness Syndrome, is the clinical identification of decreased circulating levels of triiodothyronine (T3), the biologically active thyroid hormone, often accompanied by normal or low levels of thyroxine (T4) and normal TSH. This pattern is typically observed in the context of acute or chronic systemic illness, stress, or starvation, rather than primary thyroid gland failure. Accurate recognition is vital to avoid inappropriate and potentially harmful thyroid hormone replacement.