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All lab tests negative?

Ugh. So after 3 months of intense bleeding and D and many more incommodating symptoms, I finally decided to go to the ER. It seems as though there is nothing suspicious in my blood, stools or urine. There's still a colonoscopy left that might tell otherwise but...Is it common for people with an IBD to show no signs in lab tests? Or is there always signs? I mean there was definately a ton of blood in the samples i gave but...?