If the difference in conductivity remains greater than 0.4 mS/cm after recalibration, what should be done?

When the difference in conductivity remains greater than 0.4 mS/cm after recalibration, it is indicating that the machine may not be operating within the safe and expected parameters for effective dialysis. Such a discrepancy suggests potential issues with the machine that could affect patient safety and the quality of the dialysis treatment.

Removing the machine and tagging it for repair or assessment is the appropriate action because it helps prevent any possible hazards associated with using faulty equipment, ensuring that patient care is not compromised. Notifying the biomed department is also crucial; they can further investigate the issue, provide repairs, or conduct necessary maintenance to bring the machine back to operational standards.

Continuing to use the machine without addressing the conductivity difference could lead to inadequate treatment or adverse effects on the patient. Lowering the dialysate sodium concentration or requesting a replacement machine immediately does not address the underlying issue of the machine's malfunction and could lead to delayed treatment or safety risks. Thus, tagging the machine and notifying the appropriate personnel is the safest and most responsible course of action.