(57) Disclosed is a method for centrifuging serum which comprises the steps of introducing
a barrier having an elastic porous member at least as its principal part into a blood-collecting
tube and centrifuging serum, the elastic porous member having a porosity of 40 % or
more, a continuous-pore size of 50 to 400 µ, and a cross-section larger than that
of the blood-collecting tube. Also disclosed is a barrier (3) to be introduced into
a blood-collecting tube (1 comprising an elastic porous member having a porosity of
40 % or more, a continuous-pore size of 50 to 400 µ, and a cross-section larger than
that of the blood-collecting tube (1), the bottom portion of the elastic porous member
preferably being a relatively hard portion (100, 111) with smaller outside diameter.
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