The aim of the study is to do a 7-year follow-up of a consecutive inception cohort of 562 adults and children diagnosed and registered with inflammatory bowel disease in 2003-04 in order to evaluate the consequences of biological therapy in the treatment of IBD. The cohort is established after the implementation of biological agents in the treatment of IBD and the investigators hypothesis is that a) Severe disease course in IBD can be predicted by phenotypic presentation by serological, genetic, clinical and endoscopic characteristics to be used as guidance in the selection of treatment strategy and b) Introduction of biological treatment changes the course of disease in IBD and reduces the need of surgical procedures.

Methods: Medical records will be reviewed to register the use of medication, flare ups (medical and surgical) and hospital admissions. Diagnosis, disease localization and behavior will be evaluated. At outpatient visits patients will get a clinical examination, blood and faeces will be collected to biobank and patients will be offered an endoscopical examination. The Montreal classification, The Harvey & Bradshaw's activity index (CD) and the SCAAI score (UC) will be used to describe disease localization, extent, behavior and severity. An electronic database will be established in use of processing data.

Inclusion Criteria:

• All patients wil be followed up and diagnosis will be reassessed.

Exclusion Criteria:

• Non-IBD (after reassessing diagnosis)

562 patients diagnosed with Crohn's disease, Ulcerative colitis or indeterminant colitis in 2003-2004 i Copenhagen City and County and registered in a database.