A -week-old infant is brought to the emergency room in coma with retinal hemorrhages and severe pallor He was born at home and was first seen by a physician at days of age and placed on amoxicillin for otitis media His diet is breast milk Diagnostic tests should include all of the following EXCEPT

Correct Answer: D

Rationale: Lumbar puncture is contraindicated in cases of severe coagulopathy or intracranial hemorrhage, as it could worsen the condition

Correct Answer: A

Rationale: The 'triangular cord' sign, a fibrotic remnant of bile ducts, is a characteristic ultrasound finding in biliary atresia.

Correct Answer: B

Rationale: Coarctation of the aorta typically causes weak femoral pulses but does not affect the right brachial pulse significantly, as the narrowing is usually distal to the right subclavian artery.

Correct Answer: C

Rationale: An Ambu bag provides manual positive pressure ventilation, making it the preferred method for oxygen delivery in a child with respiratory arrest.

Correct Answer: B

Rationale: The Glasgow Coma Scale evaluates consciousness. Eye-opening to pain (2), verbal confusion (4), and withdrawal from pain (4) sum up to a total score of 10.