A medical testing machine provides improved recall and display of the outcomes of tests performed by the machine. Test outcomes and other information are stored in mass storage directly accessible by the medical testing machine. In one aspect, outcomes of tests relating to a particular patient may be recalled. The system may be especially useful for tests that may be performed multiple times for a particular patient over a period of time, for example testing for HbA1c hemoglobin levels in diabetes patients. According to another aspect, the medical testing machine may store an accession number for each test outcome, and may enable a user to display as a group test outcomes having the same accession number. The system may store further information and associate it with particular test outcomes, for example calibration information. The system may also store a set of rules under which each test instance was run.