Type C is the " baseline" plasma sodium concentration level is set lower than normal.

C型指血浆钠离子浓度的阈值低于正常值。

This type is particularly unique because the plasma sodium concentration is stable, unlike other SIADH's where it would continue to fall.

C型的特点是血浆钠离子浓度相对稳定，不像其它类型中，会持续降低。