A 1-Week-Old Boy Is Brought to the Emergency Department Due

A 1-week-old boy is brought to the emergency department due to recurrent vomiting and poor feeding.  The infant was born at term via spontaneous vaginal delivery with no complications.  Temperature is 36.7 C (98 F) , blood pressure is 58/30 mm Hg, pulse is 180/min, and respirations are 40/min.  On examination, the patient is tired appearing with a sunken anterior fontanelle and dry mucous membranes.  The remainder of the examination is unremarkable.  Laboratory results are as follows: Which of the following additional laboratory findings are most likely to be seen in this patient?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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