Other contributors have said "What are serum sperator tubes?" is the same question as "What is the difference between serum and plasma testing tubes?" If you believe that these are not asking the same thing and should be answered differently, click here
What is the difference between serum and plasma testing tubes?
The clear liquid that can be separated from clotted blood. Serum differs from plasma, the liquid portion of normal unclotted blood containing the red and white cells and platelets. Its is the clot that makes the difference between serum and plasma.
PLASMA is the clear, yellowish fluid portion of blood, lymph, or intramuscular fluid in which cells are suspended. It differs from serum in that it contains fibrin and other soluble clotting elements...
Serum is a type of blood plasma that does not have any clotting factors because they have been removed by letting the blood clot first before the plasma is separated.
Pipe n tube are same in shape etc. BUT only difference isPipe is used for Transferring Material (Gas, Liquid etc.)AND where it is used for Heat Exchanging purpose , It is called TUBE.