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Encyclopedia > Blood tests

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, acting as a medium for 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.

Contents

Chemistry

Specific biochemical blood tests include:

Hematology

Hematological tests include:

Microbiology

Blood cultures are commonly taken if infection is suspected. Positive cultures and resulting sensitivity results are often useful in guiding medical treatment.


Special tests

These 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


  Results from FactBites:
 
Blood test - Wikipedia, the free encyclopedia (428 words)
Blood tests are laboratory tests done on blood to gain an appreciation of disease states and the function of organs.
Blood is obtained from a patient by venipuncture, except for tests such as Arterial blood gas.
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.
Blood Test Results Normal Range Reference Chart - BloodBook, Blood Information for Life (1947 words)
Blood test results, made possible by the taking of Blood tests, are one of the most important tools that your doctor uses in evaluating your health status.
Blood tests, including various Blood chemistry and hematology 'Blood tests' offered by most test labs, represent an economical way by which quality information about a patient's physical condition, at the time of the Blood testing, can be made available to the physician.
Tests are rated in terms of their sensitivity (the probability that their Blood testing results will be positive when a disease is present) and their specificity (the probability that their test results will be negative when a disease is not present).
  More results at FactBites »


 

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