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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Hypovolemia means any decrease in the blood volume and does not already mean hypovolemic shock. For example, donation of 500 mL blood causes hypovolemia, but usually not shock 12.Hypovolemic shock may start to develop at 10-20% blood loss (0.5-1 liter blood) because of inadequate perfusion of the body tissues.ypovolemia means any decrease in the blood volume and does not already mean hypovolemic shock. For example, donation of 500 mL blood causes hypovolemia, but usually not shock 12.