A patient with chronic renal insufficiency who has been taking laxatives and presents with confusion, muscle weakness, and decreased deep tendon reflexes MOST likely has:
A) decreased serum sodium levels.
B) an overall decrease in serum potassium.
C) an increased serum level of magnesium.
D) increased intracellular magnesium levels.
Answer: C) an increased serum level of magnesium.
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