The preservation effectivity of slaughter animal blood for consumptive purposes was studies by a method of non-phrenic action with solidified CO2. The material for studies was full pig blood stabilized with sodium citrate. The course of the changes in plasma proteins caused by storage has been described by regression equations. It was found that non-phrenic contact of blood with solidified CO2 caused slight, statistically insignificant changes in plasma proteins. Moreover, the changes of the protein quality factors showed a smaller dynamics in the blood stabilized with solidified CO2 than in the control blood. The changes observed in the plasma proteins analysed were highly correlated with increasing parallel decomposition of morphological elements and the resulting increase of the level of hemocyte proteins in plasma.