Longman Dictionary of Contemporary English
Wiktionary
n. (context medicine English) A test that gives information about the cells in a patient's blood.
WordNet
n. the number of red and white corpuscles in a blood sample
the act of estimating the number of red and white corpuscles in a blood sample
Wikipedia
"Blood Count" is a 1967 jazz composition by Billy Strayhorn. It was originally meant for a three-piece work Strayhorn was writing for Duke Ellington and initially titled "Blue Cloud". However, Strayhorn was hospitalized in 1967 due to cancer and finished the composition while in the hospital. He died on 31 May and "Blood Count" was his last finished composition. The Ellington orchestra debuted "Blood Count" at a Carnegie Hall concert in March, this was later released as The Greatest Jazz Concert in the World. In August 1967 Ellington recorded the tune on his tribute album for Strayhorn, ...And His Mother Called Him Bill. Although Ellington never played the tune again after the recording session, many other artists have since recorded it, including Stan Getz, Jimmy Rowles, Joe Henderson and Bobby Watson. "Blood Count" will be a part of the repertoire for the 2013 Essentially Ellington competition.
Usage examples of "blood count".
The talk in the papers about the dangers of radioactivity and X-rays may have been exaggerated, but I make sure anyone who works with me has a regular blood count to set their minds at rest.
We could sedate the Negroes, lower their white-blood count and keep them out of my hotels.