Definition of Complete blood count

Complete blood count:A set values of the cellular (formed elements) ofblood. These measurements are generally determined by specially designed machines that analyze the different components of bloodinless than a minute.

The values generally included are the following:

• White blood cell count(WBC). The number of white blood cells in a volume of blood.Normal rangevaries slightly between laboratories but is generally between 4,300 and 10,800 cells per cubic millimeter (cmm). This can also be referred to as theleukocyte countand can be expressed in international units as 4.3 - 10.8 x 10⁹cells perliter.
• Automated white cell differential. A machine generated percentage of the different types of white blood cells, usually split intogranulocytes, lymphocytes, monocytes, eosinophils, and basophils.
• Red cell count (RBC). The number of red blood cells in a volume of blood. Normalrangevaries slightly between laboratories but is generally between 4.2 - 5.9 million cells/cmm. This can also be referred to as theerythrocytecount and can be expressed in international units as 4.2 - 5.9 x 10¹²cells per liter.
  
  
  
  
• Hemoglobin (Hb). The amount of hemoglobin in a volume of blood. Hemoglobin is theproteinmoleculewithinred blood cellsthat carriesoxygenand gives blood its red color. Normal range for hemoglobin is different between the sexes and is approximately 13 - 18 grams per deciliter for men and 12 - 16 for women (international units 8.1 - 11.2 millimoles/liter for men, 7.4 - 9.9 for women).
• Hematocrit (Hct). The ratio of the volume of red cells to the volume of whole blood. Normal range for hematocrit is different between the sexes and is approximately 45 - 52% for men and 37 - 48% for women.
• Mean cell volume(MCV). The average volume of a redcell. This is a calculated value derived from the hematocrit and red cell count. Normal range is 86 - 98 femtoliters.
• Mean cell hemoglobin(MCH). The average amount of hemoglobin in the average red cell. This is a calculated value derived from the measurement of hemoglobin and thered cell count. Normal range is 27 - 32 picograms.
• Mean cell hemoglobin concentration(MCHC). The average concentration of hemoglobin in a given volume ofred cells. This is a calculated volume derived from the hemoglobin measurement and the hematocrit. Normal range is 32 - 36%.
• Red cell distribution width(RDW). A measurement of the variability of red cell size. Higher numbersindicate更大的大小的变化。正常范围是11 - 15.
• Platelet count. The number ofplateletsin a volume blood. Platelets are not complete cells, but actually fragments ofcytoplasmfrom a cell found in thebone marrowcalled amegakaryocyte. Platelets play avitalrole in blood clotting. Normal range varies slightly between laboratories but is in the range of 150,000 - 400,000/ cmm (150 - 400 x 10⁹/liter).