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.
Chem7 test - a battery of blood chemistry tests; the seven parts of a Chem7; sodium, potassium, chloride, bicarbonate, blood urea nitrogen (BUN), creatinine, and glucose
Blood cultures are commonly taken if infection is suspected. Positive cultures and resulting sensitivity results are often useful in guiding medical treatment.
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.
Bloodtest results, made possible by the taking of Bloodtests, are one of the most important tools that your doctor uses in evaluating your health status.
Bloodtests, including various Blood chemistry and hematology 'Bloodtests' offered by most test labs, represent an economical way by which quality information about a patient's physical condition, at the time of the Bloodtesting, can be made available to the physician.
Tests are rated in terms of their sensitivity (the probability that their Bloodtesting 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).