It is interesting to see what other doctors do and won't do based on platelet count. I've had a colonoscopy done with counts as low as 20k, even when there was thought that I had GI bleeds due to my ITP.
I had been suffering from anemia, which was thought to be from chronic GI bleeds, a problem due to ITP. My doctor wanted to make sure I had no polyps that could contribute to GI bleeding, we felt the risk of the scope was worth it and the GI doctor would have been able to remove and cauterize a polyp that was causing the problem bleeding.
I was having major problems with anemia, which were requiring iron and blood transfusions. I also was having stomach upset and other GI problems, which I was hoping could be identified and resolved with the scope.