What does the term "serum" refer to in laboratory contexts?

The term "serum" in laboratory contexts specifically refers to the liquid portion of blood that remains after clotting has occurred. It is distinct from plasma, which is the liquid component of blood that includes clotting factors and is obtained before clotting occurs. During the clotting process, blood cells and clotting factors are removed, leaving behind serum, which contains electrolytes, antibodies, hormones, and waste products.

This definition is essential for laboratory practices, as serum is often analyzed in various tests to assess health, diagnose diseases, and monitor treatment responses. Understanding the composition and properties of serum is crucial for medical technologists, as they frequently perform tests that utilize this component of blood.