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A member asked:
What could cause low t4 with normal tsh and t3 (liothyronine)? have tested low twice now. also currently being tested for cushing's.
3 doctors weighed in across 2 answers
Thyroid: Hard to accept a low T4 with the others normal. Please verify this with your doctor. Why are you being tested for Cushing's. Please let me know.
Answered 2/22/2016
1.6k views
See answer: To be accurate the T4 measurement should be Free Thyroxine. If that is low with normal TSH it can be due to "Central" Hypothyroidism: something affecting the hypothalamus or pituitary. Pituitary adenomas are the most common cause. In this case the TSH is biologically inactive.
Answered 2/23/2016
1.6k views
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