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Based on limited metadata available, M Dialysis AB, a medical device manufacturer, received an FDA Warning Letter on June 6, 2018. Without access to the full warning letter text or detailed subject information, the specific nature of the violations cannot be determined from the metadata provided. The warning falls under FDA's medical device regulatory authority, though the specific issuing office and violation details are not available in this summary record. For a complete understanding of the regulatory concerns, the full warning letter document would need to be reviewed.