There is provided a method for identifying the color intensities of red lines on a white test strip, comprising the steps of (A) attaching said white test strip to a card that is larger and darker than said white test strip, (B) scanning said card with said attached white test strip, (C) creating a digital image of said card, wherein each pixel in said digital image has a Red value, a Green value, and a Blue value, (D) using said digital image to calculate a color intensity for each red line on said white test strip.