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(1) The ratio of blood volume that is occupied by red blood cells, usually expressed as a percentage of the total blood volume.

(2) The instrument used to determine the relative amounts of corpuscles and plasma in the blood.


An average (normal) value in men is 46% and in women is 38%.

Word origin: the term "hematocrit" was coined in 1903. Its roots stem from the Greek words hemat - blood, and krites, judge - meaning to gauge or judge the blood.

Abbreviation: Ht, HCT. Variant: haematocrit.

Synonym: packed cell volume (PCV), erythrocyte volume fraction (EVF).