Three types of medical granulated activated carbon (AC) with increased porosity (3 samples of each): SCN (derived from N-containing synthetic polymers, Ukraine), K-814 (derived from coconut shell, Silcarbon, Germany), BAC (derived from petroleum pitch, Kureha, Japan) were obtained by the method of steam activation in fluidized bed of the laboratory furnace. Nine samples were evaluated using low temperature nitrogen adsorption and compared with direct sorption capacity measurement method for markers of the main groups of toxic substances: freely soluble compounds with small and medium molecular weight (creatinine-Creat., methylene blue-MB, vitamin B12), protein-bound toxins (unconjugated bilirubin-Bil.) and carrier protein of hydrophobic compounds (human serum albumin -HSA). Scale of this type, representing practically important groups of substances to be removed by AC, can be called informative marker scale (IMS). Table1. Low temperature nitrogen adsorption parameters and quantity of markers adsorbed by 1 g of AC after 2 hours of mild shaking In Table 1, along with the summary of IMS, the results of nitrogen adsorption are presented, namely: SBET, Vs, Vmicropores, Vmesopores. All 3 types of sorbents during activation demonstrate the growth of the IMS and nitrogen adsorption parameters. Moreover, the sorption characteristics of SCN and BAC-MU (synthetic AC) surpass those of K 814 AC made from coconut shell. At the same time, the porometric indices do not always correlate with the values of the IMS. For example, samples 3 and 9 in the table with a significant similarity in porometric indices SBET, Vs, Vmicropores, Vmesopores show almost 4 times the difference in the adsorption of unconjugated bilirubin from albumin solution. This result indicates a certain advantage of the informative marker scale (IMS) method in comparison with those of low temperature nitrogen adsorption in assessing the adsorptive properties of activated carbons for medical use.