- The proportion of the blood that consists of packed red blood cells. The hematocrit is expressed as a percentage by volume. The red cells are packed by centrifugation. For example, an hematocrit of 25% means that there are 25 milliliters of red blood cells in 100 milliliters of blood. The red cells make up a quarter of the blood. The normal ranges for the hematocrit are dependant on the age and, after adolescence, the sex of the individual. The normal ranges for the hematocrit are: 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% These values may vary slightly between laboratories. The term "hematocrit" was coined in 1903 and comes from the Greek roots hemat-, blood + krites, judge = to judge or gauge the blood. The abbreviation for hematocrit is hct. In medical slang the hematocrit is called the crit.
* * *1. Percentage of the volume of a blood sample occupied by cells. Cf.:plasmacrit. 2. Obsolete term for a centrifuge or device for separating the cells and other particulate elements of the blood from the plasma. [hemato- + G. krino, to separate]
* * *he·mat·o·crit or chiefly Brit hae·ma·to·crit hi-'mat-ə-krət, -.krit n1) an instrument for determining usu. by centrifugation the relative amounts of plasma and corpuscles in blood2) the percent of the volume of whole blood that is composed of red blood cells as determined by separation of red blood cells from the plasma usu. by centrifugation <a \hematocrit ranging from 42% to 52% in males and 35% to 47% in females is typically considered normal> called also packed cell volume
* * *he·mat·o·crit (Hct) (he-matґə-krit) [hemato- + Gr. krinein to separate] the proportion of the volume of a blood sample that is red blood cells (packed red blood cells), measured in mL per dL of whole blood or as a per cent.
Medical dictionary. 2011.
См. также в других словарях:
Hematocrit — Intervention Blood components MeSH … Wikipedia
hematocrit — HEMATOCRÍT, hematocrite, s.n. Aparat care permite separarea prin centrifugare a elementelor celulare din plasmă, pentru stabilirea gradului de diluţie sau de concentrare a sângelui; hematoglobinometru. – Din fr. hématocrite. Trimis de gall, 13.09 … Dicționar Român
hematocrit — [hem′ə tō krit΄, hē′mətō krit; hi mat′əkrit΄] n. [< HEMATO + Gr kritēs, a judge < krinein, to separate: see HARVEST] 1. a small centrifuge or its calibrated tube used to determine the relative volumes of blood cells and fluid in blood 2.… … English World dictionary
hematocrit — /hi mat euh krit/, n. 1. a centrifuge for separating the cells of the blood from the plasma. 2. 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… … Universalium
hematocrit — noun 1. the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit • Syn: ↑haematocrit, ↑packed cell volume • Hypernyms: ↑ratio 2. a measuring instrument to determine (usually by… … Useful english dictionary
hematocrit — noun Etymology: International Scientific Vocabulary hemat + Greek kritēs judge, from krinein to judge more at certain Date: circa 1903 the ratio of the volume of red blood cells to the total volume of blood as determined by separation of red… … New Collegiate Dictionary
Hematocrit — zwei Blutproben, rechts frisch abgenommen, links mit sedimentierten zellulären Bestandteilen. Dieser Anteil stellt den Hämatokrit dar Hämatokrit (Abkürzung: Hct, Hkt oder Hk) bezeichnet den Anteil aller zellulären Bestandteile am Volumen des… … Deutsch Wikipedia
hematocrit — noun a) The percentage (by volume) of packed red blood cells in a centrifuged sample of blood b) A centrifuge used to analyze the relative amount of red blood cells and plasma in blood … Wiktionary
hematòcrit — he|ma|tò|crit Mot Pla Nom masculí … Diccionari Català-Català
hematocrit — n. centrifuge for separating blood cells from plasma; relationship between the volume of cells and the volume of blood separated by a centrifuge … English contemporary dictionary