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Determination numbers of leukocytes enters into a minimum of researches which appoint to all patients in a hospital or a polyclinic. At the healthy person the number of leukocytes in blood is changeable. After heavy physical job, reception of a hot bath, at women in pregnancy, in the course of sorts and before the beginning menstruatsii it increases. Same occurs after food intake. Therefore, that results of the analysis were objective, it is necessary to hand over it on an empty stomach, in the morning, not to have breakfast, it is possible to drink only a water glass. In norm the maintenance of leukocytes in 1 l of blood of the adult person makes from 4,0-9,0x109. At children it above: At the age of one month - 9,2-13,8x109/л, from 1 till 3 years - 6-17x109/л, at the age from 4 till 10 years - 6,1-11,4x109/l.