Newly "diagnosed" Crohnie?

Howdy everyone!

A little history before I get to my question:
In early November of this year, I went through the worst sickness I've ever experienced; vomiting, diarrhea that was just bile, unable to drink or eat anything, fever/chills, etc. for 3 days before I finally went to a GI doc after doubling over in pain from trying to eat chicken broth and noticing my stool had become all blood.
He was really concerned about my extreme dehydration and symptoms and put me in the hospital right away. At the hospital they checked my lovely ketchup-looking stool daily, got me hydrated and eating liquids, and finally released me after 3 days of countless blood tests.
Doctor calls me the next day and says the blood test is positive for Crohns. So I have and endoscopy and colonoscopy. Both showed VERY little inflammation, most of which he believes came from the colon prep. So now I've got to schedule my small intestine x-ray, but here's my question:
Has anyone had a false positive? Aside from my immune system being noticeably weaker (got strep throat AND bronchitis since the beginning of Nov.), and my past history if diarrhea and nausea, I've felt pretty good since all this :/
Sorry for the long story, I'm just confused. My 15-year-old cat Odin has had IBD for over a year now so I'm no stranger to the drugs, symptoms, and treatment in cats, but when it comes to humans I'm in the dark! Lol Guess that's what I get for devoting my life to animals :)
Thanks in advance, guys!!

Post Edited (KatteneMeow) : 12/28/2013 9:16:54 PM (GMT-7)

Poor cat. I wouldn't wish this illness on my worst human enemies, let alone a defenceless animal *shakes head*

If the blood test which tested 'positive' for Crohn's was the Prometheus serology test, it most certainly does have some false positives. According to which studies you look at, the specificity for IBD varies anything from 61-90%. Specificity in this instance refers to the probability that a person who doesn't have IBD tests (corrrectly) negative for IBD. If the specificity is 80%, that would mean out of every 100 people who do not have IBD, 20 are wrongly told that they do have IBD. So the false positive rate is actually quite high.

But you also want a test with high sensitivity; that is, tests positive for IBD when you really do have IBD. Again, results vary wildly depending on which studies you look at.

Obligatory link: ispub.com/IJGE/10/1/13483#sthash.K2Fvby4V.dpbs

tl;dr version - The prometheus test is too unreliable for a diagnosis to be made on the basis of a positive result. Follow-up tests have to be done, which your doctor seems to be doing with admirable promptness. Do exactly as kazbern suggested; move on if all tests turn out to be negative, but go straight back to the same GI if you get sick again.