微小的组织如肾穿标本、肝穿标本，纤支镜、胃镜咬检标本等直接进行冰冻切片是困难的，必须用包埋剂包埋后才能冰冻切片，以取得完整的组织切片。目前国内一些单位使用进口包理剂，效果好，但价格贵。一些单位使用甲基纤维素用水调成糊状作包埋剂，价格低但效果不如进口产品。 Micro-tissue such as kidney through the specimen, liver through the specimen, bronchoscopy, gastroscopy bite specimens directly frozen section is difficult, must be embedded with embedding agent to frozen section, in order to obtain complete tissue sections. At present, some units in China use imported packaging agent, the effect is good, but the price is expensive. Some units use methyl cellulose water into a paste for embedding agent, the price is low but the effect is not as good as imported products.