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A week-old boy is brought to the emergency department due to vomiting and poor feeding. His mother received appropriate prenatal care, and the full-term infant was delivered at home. Temperature is 36.7 C (98 F) , blood pressure is 40/24 mm Hg, pulse is 164/min, and respirations are 46/min. Physical examination is notable for sunken eyes, a depressed anterior fontanelle, and dry mucous membranes. Capillary refill is 3 seconds, and skin turgor is decreased. No abdominal masses are noted. Genital examination shows a normal uncircumcised penis with bilateral testes palpable in the scrotum. Laboratory results are as follows: Which of the following is most likely to be increased in this patient?
Allergist
An allergist is a medical professional specializing in the diagnosis and treatment of allergic conditions and immune system disorders.
Electroencephalography
A non-invasive method to record electrical activity of the brain using electrodes placed on the scalp.
Electrocardiography
The process of recording the electrical activity of the heart over a period of time using electrodes placed on the skin.
Electromyography
A procedure in which needle electrodes are inserted into some of the skeletal muscles and a monitor records the nerve impulses and measures conduction time; used to detect neuromuscular disorders or nerve damage.
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