② urinary alteration urine specific urine volume gravity Naf early ADH↓ or stage ADS t late ADH t stage ADS tt (注:经肾失訥的低渗性脱水,尿訥不藏少)② urinary alteration urine specific urine volume gravity [Na+ ] ---------------------------------------------------------- early ADH ± or stage ADS late ADH stage ADS ----------------------------------------------------------- (注：经肾失钠的低渗性脱水，尿钠不减少)