WHAT IS OSMOLALITY (URINE)?
The measure of the number of osmotically active particles in a given urine volume, which reflects the kidney’s concentrating ability. Normal fluid balance is achieved by the action of the posterior pituitary (ADH secretion) and properly functioning kidneys. Fine adjustments are made continuously to maintain normal fluid and electrolyte balance. The kidney is able to adjust the urine concentration over a wide range to maintain a normal serum concentration or osmolality. Normally, when the client becomes even slightly dehydrated, the urine will become more highly concentrated. Therefore, if there is high fluid intake, the urine will become more dilute in ridding the body of the excess fluid.