Blood test
Blood tests are laboratory tests done on blood to gain an appreciation of disease states and
the function of organs. Since blood flows throughout the body, providing oxygen and
other nutrients, and drawing waste products back to the excretory systems for disposal, the state of the bloodstream affects, or
is affected by, many medical conditions. For these reasons, blood tests are the most commonly performed medical tests.
Blood is useful as it is a relatively non-invasive way to obtain cells, and
extracellular fluid (plasma), from the body to check on its health. Although the term blood test is used, most routine tests
(except for most haematology) are done on plasma or serum.
Chemistry
Specific biochemical blood tests include:
Hematology
Hematological tests are:
Techniques
General biochemical techniques often used in blood testing include:
DNA testing is today possible with even very small quantities of blood:
this is commonly used in forensic science, but is now also part of
the diagnostic process of many disorders.
Serology
Serology are blood tests are often used to diagnose sexually transmitted diseases. Some jurisdictions
insist on blood tests before marriage. Many states also require blood tests for all newborn babies.
See also
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