A system for displaying measured values of a complete blood count, CBC, parameter, the system comprising: - a user interface (110, 112); and - an electronic processor configured to display a first set of measured values of the CBC parameter obtained from a plurality of samples from a first lot of a quality control composition, wherein the displaying comprises displaying a marker corresponding to each measured value from the first lot on a first plot comprising a two dimensional coordinate system on the user interface, wherein the two dimensional coordinate system comprises a first dimension corresponding to a time at which values of the CBC parameter were obtained, and a second dimension corresponding to a numerical value of the CBC parameter, characterized in that: the electronic processor is configured to display a second set of measured values of the CBC parameter together with the first set of measured values wherein the displaying comprises displaying a marker corresponding to each of the second set of measured values on a second plot on the user interface comprising a two dimensional coordinate system, and wherein the two dimensional coordinate system of the second plot comprises a first dimension corresponding to a time at which the second set of measured values of the CBC parameter were obtained. - a user interface (110, 112); and - an electronic processor configured to display a first set of measured values of the CBC parameter obtained from a plurality of samples from a first lot of a quality control composition, wherein the displaying comprises displaying a marker corresponding to each measured value from the first lot on a first plot comprising a two dimensional coordinate system on the user interface, wherein the two dimensional coordinate system comprises a first dimension corresponding to a time at which values of the CBC parameter were obtained, and a second dimension corresponding to a numerical value of the CBC parameter, characterized in that: the electronic processor is configured to display a second set of measured values of the CBC parameter together with the first set of measured values wherein the displaying comprises displaying a marker corresponding to each of the second set of measured values on a second plot on the user interface comprising a two dimensional coordinate system, and wherein the two dimensional coordinate system of the second plot comprises a first dimension corresponding to a time at which the second set of measured values of the CBC parameter were obtained. wherein the two dimensional coordinate system comprises a first dimension corresponding to a time at which values of the CBC parameter were obtained, and a second dimension corresponding to a numerical value of the CBC parameter, characterized in that: the electronic processor is configured to display a second set of measured values of the CBC parameter together with the first set of measured values wherein the displaying comprises displaying a marker corresponding to each of the second set of measured values on a second plot on the user interface comprising a two dimensional coordinate system, and wherein the two dimensional coordinate system of the second plot comprises a first dimension corresponding to a time at which the second set of measured values of the CBC parameter were obtained. the electronic processor is configured to display a second set of measured values of the CBC parameter together with the first set of measured values wherein the displaying comprises displaying a marker corresponding to each of the second set of measured values on a second plot on the user interface comprising a two dimensional coordinate system, and wherein the two dimensional coordinate system of the second plot comprises a first dimension corresponding to a time at which the second set of measured values of the CBC parameter were obtained.