A method for resupplying assay reagents, calibration solutions and control solutions inventoried on-board an automatic clinical analyzer controlled by a software executed by a computer programmed to track reagent and assay chemical solution consumption along with time and analyse inventory demand for specifically defined time periods by: averaging an assay, calibration procedure and control procedure demand pattern placed upon the analyzer for assays, calibration procedures and control procedures over a sequence of previous specifically defined time periods to obtain an averaged assay, calibration procedure and control procedure demand pattern; prior to a specifically defined time period following the sequence of previous specifically defined time periods, compare the averaged assay, calibration procedure and control procedure demand pattern with the reagents, calibration solutions and control solutions inventoried onboard the analyzer, thereby determining which reagents, calibration solutions and control solutions are forecast to be exhausted before the specifically defined time period following the sequence of previous specifically defined time periods; and, displaying or issuing an alert message to an operator identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; a Laboratory Information System or Hospital Information System where the analyzer is located identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; or a Manufacturer Information System identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; to ensure an uninterrupted supply of reagents, calibration solutions and control solutions within the analyzer, wherein the sequence of previous specifically defined time periods comprises a number of 24-hour periods, or the specifically defined time periods are 24-hour periods of time corresponding to the seven different days in a week. averaging an assay, calibration procedure and control procedure demand pattern placed upon the analyzer for assays, calibration procedures and control procedures over a sequence of previous specifically defined time periods to obtain an averaged assay, calibration procedure and control procedure demand pattern; prior to a specifically defined time period following the sequence of previous specifically defined time periods, compare the averaged assay, calibration procedure and control procedure demand pattern with the reagents, calibration solutions and control solutions inventoried onboard the analyzer, thereby determining which reagents, calibration solutions and control solutions are forecast to be exhausted before the specifically defined time period following the sequence of previous specifically defined time periods; and, displaying or issuing an alert message to an operator identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; a Laboratory Information System or Hospital Information System where the analyzer is located identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; or a Manufacturer Information System identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; an operator identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; a Laboratory Information System or Hospital Information System where the analyzer is located identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; or a Manufacturer Information System identifying the type of and number of reagents, calibration solutions and control solutions forecast to be exhausted and that need to be resupplied; to ensure an uninterrupted supply of reagents, calibration solutions and control solutions within the analyzer, wherein the sequence of previous specifically defined time periods comprises a number of 24-hour periods, or the specifically defined time periods are 24-hour periods of time corresponding to the seven different days in a week.