does plasma contain platelets
Neither plasma or serum contain red or while blood cells or platelets, but they contain all the other substances, except for the fibrinogen, which is not present in the serum.erum differs from plasma in that it does not contain the clotting factor known as fibrinogen. Improper handling or extraction of a blood sample may lead to a discoloration of blood plasma and serum. Plasma is the fluid portion of blood.