一个小瓶子或装上少量水的容器是一种显示多少血将被抽的方法。
A small vial or container with a little water in it is one way of showing how much blood will be withdrawn.
Mart等人对这个过程进行了描述：150毫升全血被吸入枸橼酸容器。
Marx et al have described this process. One hundred and fifty milliliters of whole blood is drawn into a citrated container.
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