- calculated serum o. the calculation of serum o. from serum sodium, glucose, and urea nitrogen values by a variety of formulae, the most common of which is: 1.86 × [Na] (mmol/L + glucose (mg/dL)/18 + BUN (mg/dL)/2.8.
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os·mo·lal·i·ty .äz-mō-'lal-ət-ē, .äs- n, pl -ties the concentration of an osmotic solution esp. when measured in osmols or milliosmols per 1000 grams of solvent
os·mo·lal äz-'mō-ləl, äs- adj
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n.
the concentration of body fluids (e.g. plasma, urine) measured in terms of the amount of dissolved substances per unit mass of water. It is usually given in units of mol kg-1.
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os·mo·lal·i·ty (oz″mo-lalґĭ-te) the concentration of osmotically active particles in solution expressed in terms of osmoles of solute per kilogram of solvent. The osmolality is directly proportional to the colligative properties of solutions: osmotic pressure, boiling point elevation, freezing point depression, and vapor pressure lowering.Medical dictionary. 2011.