AM VaultPractice questions › Adult health: medicine › Thyroid disease
Thyroid disease
A practice question in the style of the AMC Part 1 MCQ exam. Choose your answer to see the explanation.
A woman on stable levothyroxine has a rising TSH after starting iron tablets with breakfast. What is the explanation?
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The answer is C: Iron reduces levothyroxine absorption.
Iron and calcium bind levothyroxine; separate them by several hours.
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This question comes from Week 4 of AM Vault: Endocrine. That week has 130 more exam-style questions like it, 5 short lessons and 150 flashcards. The course starts free with Week 1 and reaches this topic in week 4, as part of a six-month plan with full mock exams along the way.
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