blood test

blood test (plural blood tests)

1. 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.
   • 1988 April 16, Mike Smith, “AIDS and Syphilis”, in Gay Community News, page 5:

     HIV-positive persons may test falsely on the standard syphilis blood tests because they may not be able to mount the "normal" immunological response required of such tests.

2. An analysis of blood performed on two subjects to determine whether they are biologically related, such as a paternity test.

• blood work

• blood count