Webster's New World Medical Dictionary

caudal anesthesia
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• Mean cell volume, which is the average
volume of a red cell. This is a calculated
value derived from the hematocrit and
red cell count, and the normal range is
86–98 femtoliters.
• Mean cell hemoglobin, which is the aver-
age amount of hemoglobin in the average
red cell. This is a calculated value that is
derived from the measurement of hemo-
globin and the red cell count. The nor-
mal range is 27–32 picograms.
• Mean cell hemoglobin concentration,
which is the average concentration of
hemoglobin in a given volume of red
cells. This is a calculated volume that is
derived from the hemoglobin measure-
ment and the hematocrit. The normal
range is 32 to 36 percent.
• Red cell distribution width, which is a
measurement of the variability of red cell
size. Higher numbers indicate greater
variation in size. The normal range is
11–15.
• Platelet count, which is the number of
platelets in a volume of blood. Platelets
are not complete cells; they are actually
fragments of cytoplasm from a cell called
a megakaryocyte that is found in the bone
marrow. Platelets play a vital role in
blood clotting. The normal range varies
slightly among laboratories but is in
the range of 150,000–400,000/cmm
(150
×
10
9
/liter to 400
×
10
9
/liter).
CBT
Cognitive behavior therapy.
CCP antibody
See 
citrulline antibody.
CD4
Transmembrane glycoprotein, which is
expressed by T-4 cells (also known simply as T
cells). See also 
T cell; T-4 cell.