By means of in vitro tests for cytotoxicity (ISO 10993-5) and haemolysis (ISO 10993-4), steps are taken to ensure that the products demonstrate sufficiently inert properties in contact with blood and tissue and have a defined toxicological profile. In this process, the cytotoxicity/growth inhibition test, which is regarded as the standard test and basic biological test for all medical products, represents the basis for toxicological evaluation of the material.