Best diagnostic test in patients with ambiguous ge

ATI LPN

ATI LPN Test Bank

Best diagnostic test in patients with ambiguous genitalia due to congenital adrenal hyperplasia is:

A. Serum testosterone B. Karyotype C. Serum 17-hydroxyprogesterone D. Pelvic ultrasound

Correct Answer: C

Rationale: Serum 17-hydroxyprogesterone confirms CAH by detecting elevated levels, per AAP (doc p148, Q557).

Best diagnostic test for Addison disease is:

A. Serum cortisol B. ACTH stimulation test C. Serum ACTH D. Adrenal ultrasound

Correct Answer: B

Rationale: ACTH stimulation test confirms adrenal insufficiency in Addison disease, per AAP (doc p150, Q589).

Most common cause of tall stature in children is:

A. Marfan syndrome B. Klinefelter syndrome C. Familial tall stature D. Growth hormone excess

Correct Answer: C

Rationale: Familial tall stature is the most common cause of tall stature, per AAP (doc p151, Q605).

A 6-year-old boy presents with fatigue and jaundice. Labs show elevated indirect bilirubin and Coombs positive. Most likely diagnosis is:

A. Hepatitis B. Biliary atresia C. Autoimmune hemolytic anemia D. Sickle cell disease

Correct Answer: C

Rationale: AIHA shows jaundice and positive Coombs, per ASH. A, B, D, E differ.

A 1-month-old infant presents with cyanosis and a murmur. Echocardiogram shows total anomalous pulmonary venous return. The next step is:

A. Surgery B. Prostaglandin E1 C. Diuretics D. Oxygen therapy

Correct Answer: A

Rationale: Surgery corrects TAPVR, per AHA. B-E are temporizing.

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