Abnormal thyroid-stimulating hormone level Inappropriately normal thyroid-stimulating hormone level 2020-07-26T09:23:47Z A normal or elevated serum thyroid-stimulating hormone (TSH) level in the face of an elevation in circulating FT4 and/or FT3. Inappropriately normal TSH Inappropriately normal TSH may reflect a laboratory error, binding protein abnormalities leading to apparent elevation of FT4 (e.g. familial dysalbuminemic hyperthyroxinemia), antibody interference with measurements of FT4, FT3 or TSH, TSH-secreting pituitary tumor (TSHoma) or a syndrome of thyroid hormone resistance.