Table 1.

Relationship between solute and water intake in those with normal or impaired kidney concentrating ability

Urine concentrating capacityNormalImpaired
Urine osmolality (mOsmol/kg)1200600
Solute excretion (mOsmol)800800
Water needed = urine volume (ml)6701340
Water balance (food + oxidation − water loss; ml)200200
Drinking (ml)4701140