The invention is directed to a method for automatically dosing a fixative solution (F) in a flexible bag (15, 115) containing at least one biological organic sample (18, 118), the method comprising the steps of: a) placing the bag (15, 115) with the sample (18, 118) in a dosing system (1, 100), preferably on a holder (17, 117), more preferably on a weighing device (16, 116) of the system (1, 100), b) computing the required volume or weight of fixative solution (F) as a function of the sample (18, 118) or the bag (15, 115) with the sample (18, 118), and c) automatically transferring the computed volume or weight of fixative solution (F) from a storage container (7, 107) into the bag (15, 115). The invention is further directed to a system (1, 100) for automatically dosing a fixative solution (F) in a flexible bag (15, 115) containing at least one biological organic sample (18, 118), a carrier (30) for said flexible bags (15, 115) as well as a storage cabinet (40, 50) for storing the carrier (30).
