According to CBS News, two newly developed blood tests may help doctors conclusively diagnose irritable bowel syndrome (IBS). With an estimated 25 million to 45 million Americans suffering from the gastrointestinal disease and no conclusive tests to prove a specific cause, some doctors consider the painful condition a psychological disorder. Researchers were able to develop the tests based on research suggesting that IBS is developed after infection from a bacterial toxin found in food poisoning. The belief is that this bacterial toxin causes the immune system to attack the intestinal tract long after the toxin is gone. The introduction of the new tests can help lessen the amount of patient suffering and speed up the process of properly treating the symptoms.