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A 45-year-old woman is noted to have fatigue and cold intolerance and is diagnosed with hypothyroidism. Her physician suspects a pituitary etiology. Which of the following laboratory finding is most consistent with this condition?
A) Low TSH, low free thyroxine
B) Elevated TSH, low thyroxine
C) Elevated TSH, elevated thyroxine
D) Low TRH

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euden57

Answer:

The answer is A: Low TSH, low free thyroxine.

Explanation:

Hypothyroidism that occurs due to pituitary alteration, is known as secondary hypothyroidism. Its diagnosis is mostly through the laboratory, which will show us low levels of TSH (Toriodes Stimulating Hormone), also accompanied by low free toroxin levels.