Thyroid hormones are needed to sustain "inappropriately" normal TSH during non-thyroidal illness syndrome: a clinical observation in severely ill patients with primary hypothyroidism.
OBJECTIVES: Non-thyroidal illness syndrome (NTIS) is a form of hypothyroidism that occurs during illness. NTIS is characterized by low thyroid hormones (TH) level in the serum and tissues, with normal serum TSH levels that are considered "inappropriately" normal. The mechanisms responsible for a lack of increase in serum TSH during NTIS.....