Serum

Definition

Serum is the liquid portion of blood that remains after clotting has occurred, devoid of cells and clotting factors. It contains water, proteins, electrolytes, antibodies, antigens, and various other substances.

Related terms

Plasma:

The liquid component of blood in which blood cells are suspended before clotting takes place, containing water, salts, enzymes, antibodies, and other proteins.

Coagulation:

The process of blood changing from a liquid to a gel, forming a blood clot which is crucial for preventing excessive bleeding.

Antigen: Any substance that causes your immune system to produce antibodies against it; this can include bacteria, viruses, or foreign substances like chemicals