setrengineer.blogg.se - Urine osmolality and specific gravity lab values

This retention of water dilutes the blood causing a decrease in osmolality back to normal levels. ADH signals for the kidneys to reabsorb and conserve water, resulting in formation of concentrated urine (which has a high osmolality). When blood osmolality increases, for example in dehydration, the hypothalamus promotes secretion of the hormone antidiuretic hormone ( ADH) from the posterior pituitary. Osmotic sensors in the body detect changes in the amount of particles in water in the bloodstream (osmolality). In health, the osmolality of blood is very tightly regulated. Serum osmolality is an important stimulus for maintaining water balance by controlling the amount of water excreted in the urine and by regulating water intake through the sensation of thirst. Unlike osmolarity, osmolality is unchanged by temperature. For clinical purposes, osmolality and osmolarity values are approximately the same and used interchangeably. Osmolarity is the number of particles in a litre of fluid. These osmotically active substances increase osmolality of a fluid and cause solvent (water) to move across membranes. Osmolality is a measure of the number of osmotically active solute particles dissolved in a kilogram of solvent (water in biological systems).

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