<unk>  components after centrifugation. SST tube.<unk>  is the process of<unk> g whole<unk> , or separating it into its component parts. This is typically done by centrifuging the<unk> . The resulting components are: * a clear solution of<unk>  plasma in the upper phase (which can be separated into its own fractions, see<unk>  plasma<unk> , * the buffy coat, which is a thin layer of leukocytes (white<unk>  cells) mixed with platelets in the middle, and * erythrocytes (red<unk>  cells) at the bottom of the centrifuge tube. Serum separation tubes (SSTs) are tubes used in phlebotomy containing a silicone gel; when centrifuged the silicone gel forms a layer on top of the buffy coat, allowing the<unk>  serum to be removed more effectively for testing and related purposes.
Blood fractionation
Infusion therapy
Plasma coblation
Plasma medicine
Transfusion therapy 
Perfusion
Exchange transfusion
Minimized extracorporeal circulation