?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (typically serum) to determine the biologically inactive reverse triiodothyronine (3, 3\', 5\' triiodothyronine), commonly known as rT3, a hormone secreted by normal thyroid glands. The level of rT3 is mostly determined to differentiate between hypothyroidism and sick patients with normal thyroid (euthyroid patients) if the question cannot be solved with thyroid-stimulating hormone (TSH) evaluation assays. High levels of rT3 are commonly found in serum in hyperthyroidism, hepatic and renal diseases, and in malnutrition or starvation.
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