A method for recording the movement of a blood product unit into and out of a refrigerated storage compartment, said method comprising the steps of: (a) labelling said blood product unit with a Radio Frequency Identification, RFID, tag wherein said RFID tag comprises a blood unit identification code; (b) providing a person authorized to move said blood product into or out of a refrigerated storage compartment with an RFID tag comprising a user identification code; (c) providing an RFID tag reader in the vicinity of said refrigerated storage compartment, wherein the RFID reader comprises antennas located both inside the refrigerated storage compartment and near the door of the refrigerated storage compartment; (d) providing a computer connected to said RFID tag reader; further comprising the following subsequently performed steps (e) automatically reading by the RFID reader the user identification code when the RFID tag comprising the user identification code comes into the range of the RFID tag reader thereby alerting software located on the computer that the person authorized to move the blood product may want to remove blood from the refrigerated storage; (f) in response to automatically reading the user identification code by the RFID reader reading by the RFID reader the RFID tags of each of the blood units to establish a first inventory of all blood units; (g) in response to completion of the establishment of the first inventory disengaging a lock of the refrigerated compartment; (h) removing a blood unit by the user; (i) reading by the RFID reader the RFID tags of each of the blood units to establish a second inventory of all blood units; (j) determining, by the computer, which blood unit was removed by the user by comparing the first and second inventories; (k) retrieving, by the computer, records from a transfusion database for determining the identity of a patient for which the blood unit is intended and if the blood unit is still useable, since it has previously been outside of refrigeration for more than an allotted time; (l) reading by the RFID reader an RFID tag of a blood unit request slip; and (m) activating, by the computer, a warning means if the patient identification retrieved from the transfusion database does not match patient identification read from the RFID tag of the blood unit request slip or if said blood unit is not still useable, since it has previously been outside of refrigeration for more than an allotted time. (a) labelling said blood product unit with a Radio Frequency Identification, RFID, tag wherein said RFID tag comprises a blood unit identification code; (b) providing a person authorized to move said blood product into or out of a refrigerated storage compartment with an RFID tag comprising a user identification code; (c) providing an RFID tag reader in the vicinity of said refrigerated storage compartment, wherein the RFID reader comprises antennas located both inside the refrigerated storage compartment and near the door of the refrigerated storage compartment; (d) providing a computer connected to said RFID tag reader; further comprising the following subsequently performed steps (e) automatically reading by the RFID reader the user identification code when the RFID tag comprising the user identification code comes into the range of the RFID tag reader thereby alerting software located on the computer that the person authorized to move the blood product may want to remove blood from the refrigerated storage; (f) in response to automatically reading the user identification code by the RFID reader reading by the RFID reader the RFID tags of each of the blood units to establish a first inventory of all blood units; (g) in response to completion of the establishment of the first inventory disengaging a lock of the refrigerated compartment; (h) removing a blood unit by the user; (i) reading by the RFID reader the RFID tags of each of the blood units to establish a second inventory of all blood units; (j) determining, by the computer, which blood unit was removed by the user by comparing the first and second inventories; (k) retrieving, by the computer, records from a transfusion database for determining the identity of a patient for which the blood unit is intended and if the blood unit is still useable, since it has previously been outside of refrigeration for more than an allotted time; (l) reading by the RFID reader an RFID tag of a blood unit request slip; and (m) activating, by the computer, a warning means if the patient identification retrieved from the transfusion database does not match patient identification read from the RFID tag of the blood unit request slip or if said blood unit is not still useable, since it has previously been outside of refrigeration for more than an allotted time.