Which factors are used in the selection of a dialyzer for a patient?

• A. Age and gender
• B. Color and price
• C. Insurance coverage
• D. Body size, clearance needs, ultrafiltration needs, and membrane biocompatibility

Answer: (D)

The key idea is that choosing a dialyzer is driven by the patient’s clinical needs and how the membrane will interact with their blood, not by appearance, cost, or demographics. Body size dictates the required surface area of the dialyzer to achieve adequate solute clearance—the bigger the patient, the more surface area is typically needed to remove wastes effectively. Clearance needs refer to how much waste product must be removed according to the dialysis prescription; higher clearance requirements may call for a dialyzer with greater efficiency. Ultrafiltration needs are about how much fluid must be removed during the session, which influences the dialyzer’s capacity to handle fluid removal safely without causing drops in blood pressure. Membrane biocompatibility concerns how the blood interacts with the membrane; more biocompatible membranes reduce inflammatory or allergic reactions and improve patient comfort and safety.

Age, gender, color, price, and insurance coverage don’t determine the technical suitability of a dialyzer.