Diagnosis is often difficult as CIP can closely mimic more common illnesses. Diagnosis is not based on a singular test but is instead based on a combination of symptoms, clinical features, and tests that exclude actual bowel obstruction and/or any other structural abnormality.

Intestinal manometry can provide more specific information about the nature and extent of the underlying dysfunction but is not widely available and is not required for diagnosis.

Other tests that may also aid in diagnosis might include (but are not limited to) abdominal x-ray, CT Scanbarium follow-through, and intestinal biopsy.