blood test

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An analysis of a sample of blood, especially for diagnostic or therapeutic purposes.
• noun The process of obtaining blood for such a test.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A serologic analysis of a sample of blood; a test in which blood is removed from a subject and analyzed to determine the presence or levels of any of a variety of substances which indicate whether the subject has health problems.
• noun An analysis of blood performed on two subjects to determine whether they are biologically related, such as a paternity test.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a serologic analysis of a sample of blood