Serum

Definition

Serum is the clear, yellowish fluid that remains after blood has clotted and the clotting factors have been removed. It contains electrolytes, antibodies, antigens, hormones, and waste products.

5 Must Know Facts For Your Next Test

1. Serum is distinct from plasma as it does not contain fibrinogen or other clotting factors.
2. It plays a vital role in diagnostic tests because it can be analyzed for various biomarkers.
3. Serum contains important proteins such as albumin and globulins.
4. It helps in immune responses by carrying antibodies throughout the body.
5. In blood tests, serum is often used to measure glucose levels, cholesterol levels, and other metabolic substances.

Review Questions

• What key components are found in serum?
• How is serum different from plasma?
• Why is serum important for diagnostic tests?

Related terms

Plasma:

The liquid component of blood that holds blood cells in suspension and contains clotting factors.

Antibodies: Proteins produced by the immune system to neutralize pathogens such as bacteria and viruses.

Albumin: The most abundant protein in blood plasma, crucial for maintaining osmotic pressure and transporting substances.