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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Relative Hypovolemia. If, hypovolemia occurred due to loss of blood/plasma from our blood vessels, to outside of our body, then it is called as âabsolute hypovolemiaâ. If it occurred due to reasons other than the fluid loss, it is called as a ârelative hypovolemiaâ. For example, when the blood vessels become wider, the blood content does not increase. This can result in a relative decrease of blood that reaches the organs like brain, heart, liver etc.