The only one capable of giving results in 20 seconds by measuring red blood cells aggregation overcoming the variables and limitations of the sedimentation method also listed in the CLSI document is the Alifax ESR analyzers. Its first result is on hand after 5 minutes from analysis start. It also has high correlation with the Westergren method. This analyzer uses the same CBC tubes with only 800 ul sample. The thermo stated is at 37°C and has thermal printer. Smart cards and latex calibration and controls are present. Needles can be easily replaced and it has an automated washing feature.