7. The method of claim 6 , wherein said decision/classification tree is first used to generate a probability value based upon the level of said at least one marker.
7. The method of claim 6 , wherein said decision/classification tree is first used to generate a probability value based upon the level of said at least one marker. 8. The method of claim 7 , wherein said neural network or support vector machine is then used to classify IBS in said sample based upon said probability value and the level of said at least one marker.