How is IBS-C diagnosed?

    Last Updated: October 25, 2023

    There is no test to diagnose IBS-C, so doctors often use blood and stool tests to rule out other diseases before reaching an IBS-C diagnosis. Rome IV criteria can be used to diagnose IBS-C based on the proportion of bowel movements rated as constipation compared to those rated as normal.[1] Symptoms need to occur at least once per week for at least three months to be considered IBS.[2]