作者rmp4vu03 (小叶)
看板ask-why
标题Re: [请益] 请问为什麽捐血小板前要捐过五百?
时间Mon Dec 24 00:08:23 2007
你好~对於你的问题,可以去问卫生署。
不过,在生物界里,很多事物是不会有定量的...只是一个范围。
我也不可能给你个定性,因为生物无时无刻会变更自己的状态,人也是!
不论生物老师,还是大学的教授都在开学的第一堂课就开宗明义地讲:
生物学包含了化学跟物理一些机制,但是用化学跟物理的方式并不能
完全诠释生物现象。
所以血球的总数不可能就是定量,impossible!
而美国的捐血袋是one size 每56天可以捐一次,不可能只是两个星期
To be eligible to donate blood, a person must be in good health and generally
must be at least 16 years of age (or in accordance with applicable state
law). Minimum weight requirements may vary among facilities, but generally,
donors must weigh at least 110 pounds. Most blood banks have no upper age
limit. All donors must pass the physical and health history examinations
given prior to donation. Volunteer donors provide nearly all blood used for
transfusion in the United States. The donor's body replenishes the fluid lost
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
from donation in 24 hours. It may take up to two months to replace the lost
^^^^^^^^^^^^^^^^^^^^^^^^^^
red blood cells. Whole blood can be donated once every eight weeks (56 days).
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Two units of red blood cells can be donated at one time, using a process
^^^^^^^^^^^^^^^^^^^^^^
known as red cell apheresis. This type of donation can be made every 16
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
weeks.
^^^^^
http://www.aabb.org/Content/About_Blood/FAQ/bloodfaq.htm
若要查血球更新率也可以上国外网站查一下
但是因各国人体质不同,会有所差异性
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※ 编辑: rmp4vu03 来自: 61.62.29.185 (12/24 00:49)
※ 编辑: rmp4vu03 来自: 61.62.29.185 (12/24 01:53)