ABSTRACT
Toxicologic pathology plays an important role in the safety evaluation of drugs.The results of toxicologic pathology can answer the basic problems of pathological lesions such as location,severity grading,nature and prognosis,etc.Necropsy and gross pathology examination are important aspects of toxicologic pathology assessment.Procedures typically include preparation for the necropsy,euthanasia procedures,identification and recording all gross lesions,collection of tissues listed in the study protocol,determination of organ weight,as well as tissue fixation so as to be ready for the subsequent tissue processing and histopathology examination.All the procedures must be done in a consistent manner and in accordance with standard operating procedures (SOPs).The present paper briefly introduced the principles of necropsy and gross pathology examination for toxicologic pathology in order to standardize the procedures and to lay foundation for the improvement of the histopathology examination in the field of preclinical safety evaluation of drugs of China.