Colloid Osmotic Pressure and Osmolality in Hyponatremia

Hyponatremia (serum sodium of less than 135 mmol/L)is a very common electrolyte disorder. The reasons for the disorder varies as well as if it is acute or chronic. In this study we wish to follow changes in colloid osmotic pressure and osmolality during the initial treatment hours. We also wish to use mass balance for the calculation of body compartments and to detect fluid translocation between these.