A 15-year-old girl is brought to the physician for a 1-week history of increasing lethargy and fatigue. She has had increased thirst and urination during this time. Her mother has rheumatoid arthritis. Which of the following is most likely to be seen in this patient?
A) Decreased glomerular filtration rate
B) Hypokalemia
C) Hyponatremia
D) Increased total body potassium
E) Increased tyrosine kinase activity
