Hct (hematocrit): Abbreviation for hematocrit.
The hematocrit is the proportion, by volume, of the blood that consists of red blood cells. The hematocrit (hct) is expressed as a percentage.
For example, an hematocrit of 25% means that there are 25 milliliters of red blood cells in 100 milliliters of blood. A quarter of the blood consists of red cells.
The normal ranges for hematocrit are dependant on age and, after adolescence, the sex of the individual. The normal ranges are:
These values may vary slightly between laboratories.