Blood plasma osmolality (Plasma osmolality)

Blood plasma osmolality is a quantitative measure of the concentration of dissolved particles (osmoles per kilogram) in plasma, primarily influenced by levels of sodium, glucose, and urea[1][3][6]. It reflects the balance between water and solutes in vascular fluid and is tightly regulated through renal function and antidiuretic hormone (ADH) activity. The normal value ranges from 275 to 295 mOsm/kg[1][5][7]. Abnormal plasma osmolality can indicate underlying medical conditions ranging from dehydration, diabetes insipidus, and SIADH to congestive heart failure, liver disease, or intoxication with toxins like methanol or ethylene glycol[1][2][4][6]. Measurement is important for diagnosing and monitoring states of abnormal fluid and electrolyte balance; its clinical management is crucial for avoiding neurologic complications (such as seizures, coma, or brain edema)[4][5][6]. There is no molecule or receptor named "Blood plasma osmolality"; this entry is a clinical laboratory parameter and does not adhere to standard molecular target definitions.

Other names

Serum osmolalityplasma osmolalityosmolality serum

Drugs alter plasma osmolality either by influencing water balance (diuretics, ADH analogs/antagonists) or by increasing osmotically active substances in the blood (mannitol, toxins)