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[hi-mat-uh-krit] /hɪˈmæt ə krɪt/
a centrifuge for separating the cells of the blood from the plasma.
Also called hematocrit value. the ratio of the volume of red blood cells to a given volume of blood so centrifuged, expressed as a percentage.
1890-95; hemato- + -crit < Greek kritḗs judge Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hematocrit
  • hematocrit is a blood test that measures the percentage of the volume of whole blood that is made up of red blood cells.
  • Blood tests with anthrax also show high hematocrit and low albumin and sodium levels.
  • hematocrit is the percent of red blood cells that are in a blood sample.
  • hematocrit is a measurement of the proportion of blood that is made up of red blood cells.
British Dictionary definitions for hematocrit


/ˈhɛmətəʊkrɪt; ˈhiː-/
a centrifuge for separating blood cells from plasma
Also called packed cell volume. the ratio of the volume occupied by these cells, esp the red cells, to the total volume of blood, expressed as a percentage
Word Origin
C20: from haemato- + Greek kritēs judge, from krinein to separate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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hematocrit in Medicine

hematocrit he·mat·o·crit (hĭ-māt'ə-krĭt')
Abbr. Hct
The percentage by volume of packed red blood cells in a given sample of blood after centrifugation.

    The American Heritage® Stedman's Medical Dictionary
    Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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    hematocrit in Science
    1. The percentage by volume of red blood cells in a given sample of blood after it has been spun in a centrifuge.

    2. A centrifuge used to determine the relative volumes of blood cells and plasma in a given sample of blood.

    The American Heritage® Science Dictionary
    Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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    Encyclopedia Article for hematocrit


    diagnostic procedure for the analysis of blood. The name is also used for the apparatus in which this procedure is performed and for the results of the analysis. In the procedure, an anticoagulant is added to a blood sample held in a calibrated tube. The tube is allowed to stand for one hour, after which the sedimentation rate (how rapidly blood cells settle out from plasma) is determined. Most acute generalized infections and some local infections raise the rate of sedimentation. A raised sedimentation rate may be among the first signs of an otherwise hidden disease.

    Learn more about haematocrit with a free trial on
    Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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