In medicine,<unk>  refers to the<unk>  of blood in a patient's circulatory system, and is essentially the blood plasma component of the overall<unk><unk>  of the body, which otherwise includes both intracellular fluid and extracellular fluid. Still, the<unk>  component is usually of primary interest, and<unk><unk>  is sometimes used synonymously with<unk> . It is related to the patient's state of hydration, but is not identical to it. For instance,<unk><unk>  depletion can exist in an adequately hydrated person if there is loss of water into interstitial tissue (e.g. due to hyponatremia or liver failure).
Intravascular volume status
Renal physiology
Cardiac reserve
Renal blood flow
Blood volume
Pathophysiology of heart failure
Dialysis adequacy
Cardiovascular physiology