Free Thyroxine Index Low. Abnormally low thyroxine may cause symptoms of hypothyroidism including weakness and fatigue, cold intolerance, shortness of breath, weight gain, constipation, cognitive problems, dry skin, hoarseness, and swelling (edema). Free t4 by the nondialytic technique is often low, and the t3 is commonly low.
Tsh is usually normal, but may be modestly elevated. And five had a low free thyroxine index with. Also low bun/creatine ratio (7).
A low tsh with an elevated ft4 or fti is found in individuals who have hyperthyroidism.
Free t4 by the nondialytic technique is often low, and the t3 is commonly low. Any tsh level above 4.0 mu/l is an indication of hypothyroidism. The free thyroxine index has generally been replaced by free thyroxine in the assessment of thyroid function, but is occasionally useful when a free t4 result is suspected of being anomalous. Tsh is usually normal, but may be modestly elevated.