The Transmembrane pressure (TMP) measures what difference across the dialyzer membrane?

Transmembrane pressure (TMP) is a critical parameter in dialysis that assesses the pressure difference across the dialyzer membrane. It is calculated by measuring the difference between the pressure on the blood side of the membrane and the pressure on the dialysate side. This pressure difference is essential because it indicates how effectively fluid and solutes are being removed from the blood during the dialysis process.

Monitoring TMP helps in determining the efficiency of the dialyzer, as a higher TMP can indicate increased resistance or fouling of the membrane, potentially affecting the treatment's effectiveness. Understanding this pressure difference is crucial for ensuring optimal dialysis performance and patient safety. Therefore, the correct choice reflects the fundamental role of pressure in the functioning of the dialyzer in renal replacement therapy.