A computer system for generating code for use in processing patient test data from point of care devices. The computer system comprises object definition storage storing a plurality of definition objects, each definition object defining a generic function to be performed in response to an output of a point of care device; instantiation data storage storing instantiation data for use in instantiating definition objects as processing objects for specific functions to be performed in response to outputs from specific point of care devices; and a code generating processor for generating code for at least one processing object to perform at least one specific processing function to process an output from a point of care device by accessing at least one definition object in the object definition storage and the instantiation data in the instantiation data storage to instantiate the at least one definition object using instantiation data for the point of care device.