生物常量

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Circulating blood volume

The amount of blood volume available in circulation.

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What it is

Blood volume is the amount of blood in the circulation. Body systems detect changes in volume and reflect them through arterial pressure changes.[1]

Why it matters

More circulating volume fills the vascular system more; too little volume leaves less fluid for the heart to pump and less pressure to maintain.[1,2]

Root causes of abnormal values

  • Core relation: More retained sodium and water expands circulating volume and loads the arterial system; volume loss reduces venous return, pumped flow, and pressure support.[1,2]

What it affects

  • It links kidney fluid balance, arterial pressure, swelling, dehydration, shock, and medication context.[1]

Interpretation traps

  • Routine blood pressure does not directly measure circulating blood volume.[1]

Related conditions

High blood pressure and heart load