April, Thanks for your reply. My daughter is 2 month old. Her endo told us to dissolve 2 gram salt in 30ml water and give her 8ml every 4 hours. She was doing fine on that before her endo cut her florinef dosage 10 days ago due to her low renin result (117). Starting from last night, she refused to take salt at some feds, so her total in-take of salt falls from 48 ml per day to 40ml per day. I do not know if the situation is caused by this, and I am not sure if it matters when the blood work is done. (right after feeding salt vs. right before the next salt feed). I will call her endo tomorrow morning and ask for another sodium/potasium check. In the meanwhile, we have to keep a close watch on her.  I am so worried. Hope everything is fine.

any suggestions?