Letter H

Hct (hematocrit)

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Hematocrit): Abbreviation for hematocrit.</P> The hematocrit is the proportion, by volume, of the blood that consists of red blood cells.

The hematocrit (hct) is expressed as a percentage.</P> 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.</P> The normal ranges for hematocrit are dependant on age and, after adolescence, the sex of the individual.

The normal ranges are:</P> > >Newborns: 55-68% >One (1) week of age: 47-65% >One (1) month of age: 37-49% >Three (3) months of age: 30-36% >One (1) year of age: 29-41% >Ten (10) years of age: 36-40% >Adult males: 42-54% >Adult women: 38-46%</LI></UL> These values may vary slightly between laboratories.

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