Biocompatibility testing is a process used to evaluate how materials interact with biological systems. It ensures that medical devices, implants, and other products that come into contact with the body do not cause harmful reactions. This testing assesses factors like toxicity, irritation, and allergic responses to ensure safety for patients. The testing typically involves both in vitro (test tube) and in vivo (live organism) studies. These studies help researchers understand how materials behave in biological environments, guiding the development of safe and effective medical products. Regulatory agencies often require biocompatibility testing before approving new medical devices for use.