An increase in the concentration of red blood cells and other blood components due to loss of blood plasma or dehydration.
From 'haemo-' (blood) + 'concentration' (from Latin 'concentrare', to bring to center). The term describes the effect of blood becoming more concentrated through fluid loss.
If you're severely dehydrated, your blood thickens through haemoconcentration—your organs struggle to get oxygen because the blood is too thick to flow easily.
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