Participating hospitals are provided with data acquisition sheets that enable standardised screening of a patient receiving at least one PRBC. These data acquisition sheets will contain the patient’s name and hospital specific identification number. Initially these acquisition sheets are part of patient’s record and will not be used for any study-associated activities. Furthermore they are not anonymised at this time point. After informed consent has been obtained according to local regulations and the patient agrees to participate in the study these data acquisition sheets will be anonymised by cutting the part of the acquisition sheet containing personal information. The anonymised data acquisition sheet will then be used to fill in the electronic case report form (eCRF). The anonymised data acquisition form will thereafter be stored at the institution for quality control. It will not be possible to connect an anonymised data acquisition sheet to a specific patient.