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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Symptoms and signs of hypovolemia (pale, cool and moist skin, increased heart rate, weak pulse) may not be present until the blood volume decreases for more than 10-20%, when hypovolemic shock starts to develop.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.