Plasma vs Serum

             Plasma        Serum
The cell-free part of blood, that has been treated with anti-coagulants.The liquid part of blood after coagulation, therefore, devoid of clotting factors as fibrinogen.
It is liquid.It is fluid.
Makes up about 55% of overall blood volume.Serum = Plasma – Clotting factor
Obtain before the coagulation.Obtain after the coagulation.
Waste removalAchieved by centrifugation.
Contains fibrinogen and albumin 
Albumin: keep fluid in bloodstream and prevent leakage 
Fibrinogen: normal clotting of blood.
Fibrinogen—>fibrin—->clot forms on blood.