In diagnosis, histopathological diagnosis is considered as the gold standard to determine diseases and their status. Before the body shows obvious clinical symptoms, the influence of drugs on the body tissues and organs can be found through histopathological examination, so providing a reference for the prevention and treatment of diseases. In drug filing, relevant institutions pay great attention to the results of histopathological diagnosis because such results can provide an important basis for judging the potential harm degree of the drugs to be filed. The guidelines issued by various regulatory agencies also require histopathological diagnosis results of short-term toxicity, sub chronic toxicity, chronic toxicity and pharmacology studies tests. As a comprehensive CRO, BIOTENIC PHARMA provides extensive, high quality services in histopathology.