Question 448 · LEK · Hypothyroidism
Which of the following sets of hormone levels might indicate primary hypothyroidism?
- A. TSH - 0.0001 mIU/l, normal FT3, normal FT4.
- B. TSH - 0.0001 mIU/l, increased FT3, normal FT4.
- C. TSH - 0.0001 mIU/l, increased FT3, increased FT4.
- D. TSH - 40.0 mIU/l, low FT3, low FT4.
- E. normal TSH, low FT3, normal FT4.
Hint
In primary thyroid failure the pituitary is intact and responds to low thyroid hormone levels; predict the TSH direction.
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