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Detective Nephron, world-renowned for his expert analytic skills, trains budding physician-detectives on the diagnosis and treatment of kidney diseases. L. O. Henle, a budding nephrologist, presents a new case to the master consultant.

Nephron (angry) My assistant is late today.
L. O. Henle enters the room with excitement.
Nephron What do you want?
Henle I…I have a case for us.
Nephron You are late today.
Henle Hypomagnesemia.
Nephron (with surprise) Excellent! A good case can change my mood.
Henle A 65-year-old man was just seen for fatigue and muscle weakness and found to have a serum magnesium level of 0.6