1. A method of predicting an initial value of an analyte in a sample, said method comprising the steps of: making a plurality of observations on a plurality of samples, wherein each observation includes a plurality of variables associated with said samples, generating an equation which approximates said plurality of observations, measuring a sample analyte value, said sample having associated therewith a container type, a storage time, and a storage temperature, inputting said container type, said storage time, said storage temperature, and said analyte value into said equation, and solving said equation to obtain an estimated initial analyte value.