| Reversed hookup between individual RO machine and home dialysis machine led to hypercalcemia. |
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| NDT Plus: Serum calcium was 6.5 mmol/L. She improved with 10 h of low-calcium hemodialysis. Investigation revealed that the drain port of the reverse osmosis machine was connected to the dialysis machine and the product water was connected to the drain leading to acute hypercalcemia. |