Molecular Classification
Other
Other Names
Plasma water content, Percentage water content in blood plasma, Water fraction of plasma
Disease Roles
Cardiovascular disease (dehydration or fluid overload can affect heart function)Renal disease (changes in plasma water content associated with kidney function)Pseudohyponatremia (lab artifact due to altered plasma water/protein ratio)

Blood plasma water content Overview

Blood plasma water content refers to the percentage of water in blood plasma, which normally ranges from about 90% to 93% depending on the source[1][2][3][5][7][8][10]. Blood plasma is the liquid, cell-free component of blood and makes up approximately 55% of total blood volume. It contains water, proteins (albumin, globulins, fibrinogen), electrolytes, nutrients, hormones, and metabolic wastes. The high water content is crucial for dissolving and transporting these molecules throughout the body, maintaining proper blood pressure and osmotic balance, enabling normal organ function, and assisting in waste elimination. Abnormal plasma water content can result from dehydration, fluid overload, altered protein/lipid concentration, or disease and may impact laboratory test results, especially sodium measurement[3]. The term "blood plasma water content" is a physiological measurement rather than a druggable target and is not classified as a molecule, receptor, enzyme, transporter, or protein. Any use as a target is incorrect and unrelated to therapeutic targeting in molecular pharmacology.

Mechanism of Action

Biological Functions

Maintenance of blood volume and pressure
Transport of nutrients, hormones, and metabolic waste
Osmoregulation
Temperature regulation
Buffering/pH balance

Disease Associations

Cardiovascular disease (dehydration or fluid overload can affect heart function)
Renal disease (changes in plasma water content associated with kidney function)
Pseudohyponatremia (lab artifact due to altered plasma water/protein ratio)
Other (electrolyte disturbances)

Safety Considerations

  • Risk of dehydration (low plasma water content)
  • Risk of fluid overload (high plasma water content)
  • Laboratory errors in sodium measurement due to abnormal plasma composition

Associated Biomarkers

Biomarker
Plasma osmolality
Serum sodium
Hematocrit
Total plasma protein
Volume status indicators