Laboratory testing can be performed on many types of fluids from the body other than blood. Often, these fluids are tested instead of blood because they can give more direct answers to what may be going on in a particular part of the body.
Some body fluid analyses include:
Samples are usually obtained through collection of the fluid in a container (urine, semen) or by inserting a needle into the body cavity and aspirating with a syringe a portion of the fluid (CSF, pericardial fluid, etc.). For additional general information on how various samples are collected, see "How samples are collected".
Once a sample is obtained, a variety of tests may be performed including chemistry tests, microscopic examinations and infectious disease tests.
Last Review Date: March 25, 2021