Endocrine and Reproductive Disorders · USMLE Step 1

A patient with hypothyroidism shows high TSH and low T3/T4. What is the most likely mechanism?

  1. Pituitary failure
  2. Thyroid gland failure
  3. TSH receptor activation
  4. Excess iodine intake
Show answer and explanation

Correct answer: Thyroid gland failure

Primary hypothyroidism presents with low thyroid hormones and elevated TSH due to pituitary compensation. Hashimoto thyroiditis is a common cause.

Difficulty: Medium Question 6 of 20

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