blood count

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

• noun The number of red blood cells, white blood cells, and platelets in a definite volume of blood.
• noun The determination of such a count.
• noun Complete blood count.

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

• noun medicine A test that gives information about the cells in a patient's blood.

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

• noun the number of red and white corpuscles in a blood sample
• noun the act of estimating the number of red and white corpuscles in a blood sample