Table 1: Normal concentration of selected uremic toxin molecules in the blood and sieving coefficient.

MoleculeNormal concentration*Sieving coefficient**

Creatinine 10.2 mg/L [51]
1.0
-microglobulin <2.0 mg/L [52]
0.35
Tumor necrosis factor-α  ng/L [52]0.2

*Used as .
**Determined from sieving coefficient versus molecular weight illustration [46].