Costs used in model
| Description of event | Unit cost (£) | Source |
| GP visit | 65 | Personal Social Services Research Unit |
| ESR+CRP test | 9.28 | NICE FC costing template |
| FC test | 23 | NICE FC costing template |
| IBS medication first line | 26 | Drug tariff July 2017 |
| IBS medication second line | 76 | Drug tariff July 2017 |
| Outpatient gastroenterology appointment | 141 | NHS reference costs |
| Colonoscopy | 499 | NHS reference costs |
CRP, C reactive protein; ESR, erythrocyte sedimentation rate; FC, faecal calprotectin; GP, general practitioner; IBS, irritable bowel syndrome; NHS, National Health Service; NICE, National Institute for Health and Care Excellence.