The diagnosis of SIADH depends on hyponatremia,urine osmotic pressure is higher than blood osmetic pressure,and antidiuretic hormone(ADH) secretion and blood volume increase.

• SIADH的诊断依赖于低钠血症、尿渗透压高于血渗透压、抗利尿激素(ADH)分泌增多、血容量增加。