Real Life Study on Iron Isomaltoside 1000 in the Treatment of ID in CKD, Heart Failure, ObGyn, IBD, Cancer and Elective Surgery (Real-CHOICE).

Inclusion Criteria: * Legally capable male and female patients, aged ≥ 18 years (no upper limit); * Written informed consent of the patient with regard to the pseudonymized documentation; * The patients are not selected by specific inclusion or exclusion criteria, but by the indication listed in the Swiss SmPC (Summary of Product Characteristics) of Monofer®; * Decision is taken to treat the patient with IIM in accordance with the current Swiss SmPC of Monofer® and by prescription; this decision is taken prior to and independent from the inclusion into the study. Exclusion Criteria: * Any contraindication regarding IIM treatment as specified in the Swiss SmPC of Monofer®; * Retrospective observation of IIM infusion; * Current or upcoming participation in an interventional clinical trial; * Prior IV iron treatment or transfusion within 3 months prior to enrolment; * Instable and/or untreated comorbidities potentially hampering the observation of the primary outcome parameter of this study; * Prisoners or persons who are compulsorily detained (involuntarily incarcerated).