- Calculate the rate of cytokine excretion in blood: (%) = [] [] [] 100 Note: [cytokine]: mean cytokine concentration in blood (ng / ml) For example: cytokine excretion rate (%) at T1-T2 = = [] 1 [] 2 [] 1 100 Ultrafitrate - The procedure for testing the cytokine concentration in the ultrafitrate was almost the same as that in the blood - The ratio of the concentration of ultrafitrate TNF-α (or IL-1b, IL-6, IL-8 and IL-10) to the plasma at the same times of T2, T3.