What is the necessary precursor besides dietary iodine required for thyroxine biosynthesis?

• T3
• thronine
• tyrosine
• TSH

All of the following conditions are causes of hyperthyroidism except:

• Graves disease
• Hashimoto thyroiditis
• toxic multinodular goiter
• triiodothyronine toxicosis

Which of the following preparations is used to attain remission of thyrotoxicosis?

• propranolol
• liotrix
• levothyroxine
• PTU

The thyroid gland normally secretes which of the following substances into the serum?

• TRH
• TSH
• thyroglobulin
• T4

All of the following conditions are causes of hypothyroidism except

• Graves disease
• goitrin-induced iodine defi ciency
• endemic goiter
• Hashimoto thyroiditis

Common tests to monitor patients receiving replacement therapy for hypothyroidism include all of the following except:

• TSH stimulation test
• serum TSH assay
•  TT4
• RT3U

The inhibition of pituitary thyrotropin secretion is controlled by which of the following?

• free T4
• TRH
• reverse triiodothyronine (rT3)
• TT4

Which of the following agents has been shown to interact with oral T4 replacement therapy?

• PTU
• Cholestyramine
• Thyrotropin
• Levothyroxine

Which of the following patient populations should not routinely be screened for thyroid disease?

• Pregnant women
• College students
• Women  60 years old
• Pregnant women

What is the average replacement dose of levothyroxine for an otherwise healthy adult?

• 50 to 100 mcg/day
• 75 to 150 mcg/day
• 100 to 200 mcg/day
• 200 to 400 mcg/day