This is a randomized prospective study of the use of the SeptiFast Test as an adjunct to traditional management of neutropenic haematological patients suspected of having infection or sepsis. The study will be performed in a two-armed manner. The blood sample for the SeptiFast Test will be collected from all included patients. However, analysis of the SeptiFast Test in the control group will only be performed at a later point in time; thus, in the control group results will not become available until the end of the study and, therefore, cannot be used for guiding clinical decisions.