Table 5. Estimates of between-device within-brand variation expressed as a) standard deviation and b) coefficient of variation (%) based on means of Radiometer ABL90. Analyser Brand Lactate concentration band (mM) 0-1.9 2.0-4.9 5.0-9.9 10.0-14.9 15+ All Standard deviation (mM) Edge .00 .00 .01 .06 .00 .03 i-STAT .00 .20 .00 .19* .00 .00 Lactate Pro .07†  .14‡ .30‡ .37‡ .54‡ .32‡ Lactate Pro2 .00 .00 .08†  .00 .00 .00 Radiometera .05 .14 .15 .00 Scout+ .01 .05 .02 .00 .00 .00 Xpress .00 .00 .00 .13 .27* .11 Coefficient of variation (%) Edge .0 .0 .1 .5 .0 .3 i-STAT .0 5.7 .0 1.5 .0 .0 Lactate Pro 5.0 4.1 3.8 3.0 2.7 3.6 Lactate Pro2 .0 .0 1.0 .0 .0 .0 Radiometera 1.5 1.7 .8 .0 Scout+ .8 1.3 .3 .0 .0 .0 Xpress .0 .0 .0 1.1 1.4 1.2 *p < 0.05 †  p < 0.01 ‡ p < 0.001. a Comparison between Radiometer 715 versus the criterion Radiometer ABL90.