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Potassium deficiency
- ... A low magnesium level is also called magnesium deficiency or hypomagnesemia. This condition is more common than levels that are too high. A high magnesium level is also called hypermagnesemia. This condition is uncommon. Most cases happen in people who have kidney failure . A magnesium blood test may also be used to help find the cause of abnormal levels of other minerals, including calcium , potassium , and phosphorus. That's because magnesium plays a role ...