naeafa

ADH cause retention of water only but not solutes so in SIADH which characterized by excessive production of ADH there is a retention of water with loss of solutes leading to a hyponatremia i.e sodium is high in urine causing high specific gravity. While in case of DI ADH level is decreased causing loss of water in urine and low specific gravity. I do not understand how addison's disease cause a high specific gravity because it is characterized by low production of aldosterone which cause loss of water in urine. I hope some one answers.