Response to therapy in IBS patients may be monitored by using questionnaires or scales such as Patient Health Questionnaire (PHQ)-15, Birmingham IBS Symptom Questionnaire, IBS Symptom Severity Scale and the Gastrointestinal Symptom Rating Scale. These are both objective and subjective evaluations and help guide further management of patients.<unk>  bowel<unk>  (IBS) may be monitored to gauge response to therapy :
Patient Health Questionnaire (PHQ)-15
Birmingham IBS Symptom Questionnaire 
IBS Symptom Severity Scale.
<175, mild IBS
175−300, moderate IBS
>300 severe IBS
An increase or decrease by at least 50 points is significant.
The Gastrointestinal Symptom Rating Scale has been modified for use in patients with IBS (GSRS-IBS) 
<175, mild IBS
175−300, moderate IBS
>300 severe IBS
An increase or decrease by at least 50 points is significant.
Irritable bowel syndrome monitoring
Pancreatic cancer screening
Drug induced liver injury screening
Colorectal cancer follow up
Zollinger-Ellison syndrome screening
Gastrointestinal varices screening
Ulcerative colitis screening
Inflammatory bowel disease screening