Type D is the least common type of SIADH where ADH secretion is completely normal, yet urine osmolality is still high.

D型是最少见的类型，其中ADH的分泌完全正常，但尿液的渗透压仍较高。

ADH levels tend to be very high so the maximum amount of fluid is retained, causing urine osmolality to be very high.

ADH水平会变得非常高，导致大量水分在体内潴留，引起尿液的渗透压大幅升高。

Low blood sodium levels and low plasma osmolarity combined with high urine osmolality and high urine sodium is a giant red flag for SIADH.

低钠血症和低血浆渗透压合并高尿液渗透压、高尿钠，是SIADH的警示。