一、活体組織的取材选择:(一)檢查的目的直接与病灶部位取材有关。例如目的要檢查某一病例发疹是否为皮肤結核——寻常性狼疮,必須采取皮疹向外扩展的边緣,而不要切取退行萎縮中心部位;檢查麻风病有无麻风桿菌存在,必須采取病灶的边緣,但要了解治疗后病理改变情况,却須采取損害的中心,因損害在中心先行消退,如能当中、边緣全取則可以观察全面病理改变,作出对照,了解边緣向外发展情况。(二)檢查結果的正确与否和选擇适当的皮疹也有很大的关系。由于皮疹在各个时期的变化不同而有不同的組織变化,例如要証实結核样型麻风有无朗罕氏細胞的存在,則須切取較陈旧的皮疹;在同样的病例要研究有无細菌存在,以选擇最新的发疹組織为最妥当。各种皮疹的損害,其組織变化也不相同,例如麻风病的紅 First, the selection of living tissue selection: (a) the purpose of the inspection and the lesion site directly related. For example, the purpose of checking whether a case of rash is skin tuberculosis - vulgaris, lupus must be taken to the edge of the expansion out, rather than cut back and shrink the center of the atrophy; check whether there is leprosy in leprosy, you must take the lesion Edge, but to understand the pathological changes after treatment, but it must take the center of damage, because the damage in the center of the first subsidence, which can be among the edge of the full access to observe the full pathological changes, make a comparison to understand the edge of the outward development Happening. (B) check the correctness of the results and choose the appropriate rash is also a great relationship. Due to the different rash changes in different periods have different organizational changes, for example, to confirm the existence of leprosy with leprosy tuberculosis leprosy cells, you must cut the older rash; in the same case to study the presence of bacteria , To choose the latest rash tissue as the most appropriate. Various rash damage, its tissue changes are not the same, such as leprosy red