Table 3.
Dialyzer membrane permeability: diffusion and convection
| Diffusion process | Convection mass transport | |
|---|---|---|
| Membrane area | Ultrafiltrate flow (QUF) | |
| Mass-transport coefficient | Hydraulic permeability | |
| Concentration gradient | Transmembrane pressure (TMP; mmHg) | |
| Blood flow×extraction coefficient | Membrane area | |
 |
Sieving coefficient (S)* | |
| ci and co are inlet and outlet solute concentrations | ||
| Molecular permeability | ||
*
|
||
| CUF is the ultrafiltrate solute concentration | ||
 |
(postdilution) | |
 |
(predilution) | |
KHD is hemodialysis clearance and KHF is hemofiltration clearance