A Newborn by Normal Vaginal Delivery Is Brought for Routine

A newborn by normal vaginal delivery is brought for routine screening. you found an increase in TSH and low thyroxine T4. Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. Physical examination reveals a normal size of the thyroid gland in the normal position. Neck ultrasound confirms an ectopic thyroid tissue beloww tounge . Which of the following is the most likely cause of this patient's otherwise normal physical examination despite abnormal thyroid laboratory findings?

A) Excess thyroxine production by an ectopic thyroid
B) Increased thyroid-binding globulin in pregnancy
C) Transplacental transfer of thyroid-stimulating antibody
D) Transplacental transfer of thyroxine
E) Transplacental transfer of TSH

Correct Answer:

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