Which pattern describes Graves disease in terms of FT4 and TSH?

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Enhance your knowledge with the Ciulla Clinical Chemistry Test. Study with interactive quizzes, featuring flashcards and multiple-choice questions. Each question offers hints and explanations for better understanding. Prepare effectively and excel in your exam!

Multiple Choice

Which pattern describes Graves disease in terms of FT4 and TSH?

Explanation:
Graves disease causes hyperthyroidism through antibodies that stimulate the TSH receptor on the thyroid. This drives the gland to pump out more thyroid hormones, so the free thyroxine level (FT4) rises. Because there is now an excess of thyroid hormones in circulation, the pituitary receives negative feedback and reduces TSH production, leading to a low TSH level. Thus the characteristic pattern is FT4 increased with TSH decreased. If FT4 were low, you’d be looking at hypothyroidism; if TSH were high with high FT4, that would suggest a pituitary-origin or TSH-secreting condition, not Graves.

Graves disease causes hyperthyroidism through antibodies that stimulate the TSH receptor on the thyroid. This drives the gland to pump out more thyroid hormones, so the free thyroxine level (FT4) rises. Because there is now an excess of thyroid hormones in circulation, the pituitary receives negative feedback and reduces TSH production, leading to a low TSH level. Thus the characteristic pattern is FT4 increased with TSH decreased. If FT4 were low, you’d be looking at hypothyroidism; if TSH were high with high FT4, that would suggest a pituitary-origin or TSH-secreting condition, not Graves.

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