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The demand for hemocompatibility is one of the fundamental requirements for a safe and sufficient application of artificial surfaces in contact with blood. Thrombus formation and infarctions of the capillary vascular system after blood-biomaterial interaction, as well as the activation of the complement system and the phenomenon of biodegradation, remain problematic areas. However, medical devices where large areas of artificial surfaces contact the blood of patients are applied in enormous quantities. In spite of the significance of this branch of modern medicine and some spectacular successes in therapy, organ support and organ replacement, clearly specified criteria and instructions for the design of devices and artificial blood-contacting surfaces do not yet exist. Standardized and generally-accepted test procedures for the precise quantification and validation of events at the blood-biomaterial interface are urgently needed: their absence limits safe medical therapy and the develo