after excluding all possible metabolic and renal causes of hyposthenuria and after obtaining normal kidney biopsies , both patients were studied in metabolic balance on a constant diet under the following conditions : ( a ) dehydration ( loss of 3-5 % body weight ) , ( b ) water loading and response to hypertonic saline , and ( c ) water loading and response to intravenous vasopressin ( pitressin ) .
C0022646
renal
C0194073
kidney biopsies