1. A physiological parameter presentation system, comprising: a processor; an electronic input receiver configured to receive an electronic value corresponding to a measured physiological parameter of a patient; a data store configured to store a plurality of historical values of the measured physiological parameter; a display module in communication with the processor configured to generate a graphical display including a semicircular gauge along which are simultaneously positioned: a range of possible values for the physiological parameter including a minimum value and a maximum value; a visual representation of at least one threshold value between the minimum value and the maximum value; a numerical display of the current value of the measured physiological parameter; an indication of a range of variation of the measured value of the physiological parameter within a particular time period, wherein the indication of the range of variation extends in a first direction along the semicircular gauge from a point corresponding to the current value to a point corresponding to a maximum value of the measured physiological parameter during the particular time period, and wherein the indication of the range of variation extends in second direction opposite to the first direction along the semicircular gauge to a point corresponding to a minimum value of the measured physiological parameter within the particular time period; and a numerical historical comparator based on one or more of the historical values of the measured physiological parameter, wherein the numerical historical comparator is made visually distinguishable from the numerical display of the current value; and an electronic display output configured to output the generated graphical display to an electronic display.