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Serum magnesium was measured in 102 consecutive patients admitted to a medical ICU. Twenty percent of these patients had hypomagnesemia and 9% had hypermagnesemia. There were no other laboratory tests or clinical features suggesting hypomagnesemia. Of all ion levels measured routinely in these patients, serum magnesium had the highest prevalence of abnormal values.
Reinhart et al. (Sat,) studied this question.