Urine osmolality is a measure of urine

Urine

Urine is a typically sterile liquid by-product of the body that is secreted by the kidneys through a process called urination and excreted through the urethra. Cellular metabolism generates numerous by-products, many rich in nitrogen, that require elimination from the bloodstream...

concentration, in which large values indicate concentrated urine and small values indicate diluted urine. In healthy individuals with restricted fluid intake, urine osmolality should be greater than 800mOsm/Kg, while a 24 hour urine osmolality should average between 500 and 800 mOsm/Kg and a random urine osmolality should be 50 to 1400 mOsm/Kg .