Which substance will dialysate never contain?

Dialysate is specifically formulated to create an optimal environment for the diffusion of waste products from blood during the dialysis process, while also maintaining necessary electrolyte balances in the patient's body.

Phosphorus is a substance that will typically be restricted or excluded from dialysate formulations. This is because patients undergoing dialysis, particularly those with renal failure, often have elevated levels of phosphorus in their blood due to the kidneys' inability to excrete it effectively. High phosphorus levels can lead to serious health complications, such as bone disease and cardiovascular issues.

Therefore, dialysate is designed without phosphorus to help control and reduce serum phosphorus levels in these patients, ensuring safer and more effective dialysis treatment. The absence of phosphorus in the dialysate helps to prevent further increases in phosphorus levels and manage the patient's overall electrolyte balance more effectively.