Following comparison of a new method for measuring calcium with a reference method, the equation of the line to describe the relationship between two methods was determined to be y = 1.044x - 0.022, with r = 0.9982.Given this information, a calcium level of 5 mmol/L determined by the reference method is equal to what calcium level by the new method?

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By convention, the reference method is considered the independent variable and plotted on the x-axis.The new test method will be plotted on the y-axis.Using the equation of the line and the reference method result, y = 1.044 (5 mmol/L) - 0.022 = 5.2 mmol/L

Following Comparison of a New Method for Measuring Calcium with a Reference