Prefiltration is for removal lipids, colloids and particles from serum.

Sterile filtration is for removal bacterial to ensure stability of long term storage of serum.

①-Vent: GPF, HGPF

②-Clarifiltration: HPP, LGFP

③-Prefiltration: HPP,LGFP

④-Sterile Filtration: SPS, APS, LPV

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