hemoconcentration
noun
he·mo·con·cen·tra·tion
variants:
or chiefly British haemoconcentration \ ˌhē-mō-ˌkän(t)-sən-ˈtrā-shən 
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Medical Definition of hemoconcentration
: increased concentration of cells and solids in the blood usually resulting from loss of fluid to the tissues — compare hemodilution sense 1