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Concept
Serology
Summary
Serology is the scientific study of serum and other body fluids. In practice, the term usually refers to the diagnostic identification of antibodies in the serum. Such antibodies are typically formed in response to an infection (against a given microorganism),cite book | author = Washington JA | title = Principles of Diagnosis: Serodiagnosis. in: Baron's Medical Microbiology |veditors=Baron S, et al.| edition = 4th | publisher = Univ of Texas Medical Branch | year = 1996 | chapter-url = | isbn = 978-0-9631172-1-2 | chapter = Principles of Diagnosis against other foreign proteins (in response, for example, to a mismatched blood transfusion), or to one's own proteins (in instances of autoimmune disease). In either case, the procedure is simple.
Serological tests are diagnostic methods that are used to identify antibodies and antigens in a patient's sample. Serological tests may be performed to diagnose infections and autoimmune illnesses, to check if a person has immunity to certain diseases, and in many other situations, such as determining an individual's blood type. Serological tests may also be used in forensic serology to investigate crime scene evidence. Several methods can be used to detect antibodies and antigens, including ELISA, agglutination, precipitation, complement-fixation, and fluorescent antibodies and more recently chemiluminescence.
In microbiology, serologic tests are used to determine if a person has antibodies against a specific pathogen, or to detect antigens associated with a pathogen in a person's sample. Serologic tests are especially useful for organisms that are difficult to culture by routine laboratory methods, like Treponema pallidum'' (the causative agent of syphilis), or viruses.
The presence of antibodies against a pathogen in a person's blood indicates that they have been exposed to that pathogen. Most serologic tests measure one of two types of antibodies: immunoglobulin M (IgM) and immunoglobulin G (IgG).
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