My 4 year old son has had 4 episodes of rectal prolapse in the last month and no other symptoms. I asked to have him tested for cf only because I found a relationship between rectal prolapse and cf while researching rp on the internet. My son's Dr. kinda poo-pooed the idea of testing him, but I pressed it and it was done. The sodium came back at 60 and the chloride was 62. The pediatrician contacted a cf specialist at Children's Hospital and the specialist said that the lack of symptoms and the low sweat test results didn't add up to cf. He said that children who present with rp usually have many other symptoms and a sodium chloride level in the 90's or higher. So we've taken another sweat test and will get the results sometime today. My question is, has anyone else ever heard of a child (or adult, for that matter) presenting like this? My son has always been above average in height and weight and has had no lung or sinus infections - not even a bad cough. No greasy stools, no extended diarrhea. A little constipation, but nothing out of the ordinary. Any ideas or comments?