Fig. 6

Simultaneous trend monitoring by commercial controls and duplicate analysis. a (normal CD4 count), b (low CD4 count) show representative graphs for simultaneous trend monitoring by duplicate analysis method and by commercial controls by plotting LJ charts. CD4 counts for commercial controls are plotted on left Y axis and % variation as obtained by duplicate analysis method is plotted on right Y axis against the no. of days on X axis. Green and red colour lines indicate % variation of samples with normal and low CD4 count, respectively. Black coloured solid line and two dotted lines on either side indicate 20% limits of percent variation, respectively. Blue line indicate CD4 counts of IMMUNO-TROL controls with blue coloured solid line and two dotted lines on either side indicating mean and 2 SD, respectively.