Final answer:
Osmolality can be measured through urine osmolality testing, which evaluates the kidneys' ability to concentrate or dilute urine.
Step-by-step explanation:
Osmolality is a measurement of the number of dissolved particles in a solution. It can be measured to determine the osmotic pressure and concentration of solutes in a solution. One way to measure osmolality is through urine osmolality testing, which evaluates the kidneys' ability to concentrate or dilute urine. This test is done on a urine sample collected at various times or over a 24-hour period. With restricted fluid intake, osmolality should be greater than 800 mOsm/kg of water, while with increased fluid intake, osmolality should be less than 100 mOsm/kg in at least one of the specimens collected.