Fig. 2

Receiver operator curve for IgG/IgM ratio of 1.10. The area under the curve is 0.987. The curve is on the left extreme and is in blue. The other red curves are for the IgG/IgM ratios of 1.2,1.3,1.5 and 2.0 respectively as we move to the diagonal line. 2.0 is closest to the diagonal line. The curve closest to the diagonal line is considered the least accurate. A value of more than 0.9 is considered excellent