Serum (blood)


Serum is the fluid and solute component of blood which does not play a role in clotting. It may be defined as blood plasma without fibrinogens. Serum includes all proteins not used in blood clotting; all electrolytes, antibodies, antigens, hormones; and any exogenous substances. Serum does not contain white blood cells, red blood cells, platelets, or clotting factors.
The study of serum is serology. Serum is used in numerous diagnostic tests as well as blood typing. Measuring the concentration of various molecules can be useful for many applications, such as determining the therapeutic index of a drug candidate in a clinical trial.
To obtain serum, a blood sample is allowed to clot. The sample is then centrifuged to remove the clot and blood cells, and the resulting liquid is serum.

Clinical and laboratory uses

The serum of convalescent patients successfully recovering from an infectious disease can be used as a biopharmaceutical in the treatment of other people with that disease, because the antibodies generated by the successful recovery are potent fighters of the pathogen. Such convalescent serum is a form of immunotherapy.
Serum is also used in protein electrophoresis, due to the lack of fibrinogen which can cause false results.
Fetal bovine serum is rich in growth factors and is frequently added to growth media used for eukaryotic cell culture. A combination of FBS and the cytokine leukemia inhibitory factor was originally used to maintain embryonic stem cells, but concerns about batch-to-batch variations in FBS have led to the development of serum substitutes.

Purification strategies

Blood serum and plasma are some of the largest sources of biomarkers, whether for diagnostics or therapeutics. Its vast dynamic range, further complicated by the presence of lipids, salts, and post-translational modifications, as well multiple mechanisms of degradation, presents challenges in analytical reproducibility, sensitivity, resolution, and potential efficacy. For analysis of biomarkers in blood serum samples, it is possible to do a pre-separation by free-flow electrophoresis that usually consists of a depletion of serum albumin protein. This method enables greater penetration of the proteome via separation of a wide variety of charged or chargeable analytes, ranging from small molecules to cells.

Usage note

Like many other mass nouns, the word serum can be pluralized when used in certain senses. To speak of multiple serum specimens from multiple people, physicians sometimes speak of sera.