Where [P.sub.t] is the processing time (min); [UA.sub.t.] is the unattended time (min); [HOL.sub.t] is the hands-on labor time (min); RPI is the relative productivity index; and RR is reportable results.
the length of unattended time is zero" seems counterintuitive to us.
the length of unattended time is zero" seemed counterintuitive to Quinn et al.
In the present study, the RPIs were differentiated by taking into account the variable lengths of unattended time that are useful for performing other tasks in the different laboratory organizations.
(e) Unattended time: any period of time long enough to leave the analyzer unattended and perform other tasks, in minutes.
(g) [RPI.sub.(UT)] (results/operator-hour): Number of reportable results/Processing time - sum of unattended time
A differentiation of RPI was made by the different unattended time (UT) values given.
3, expressed as RPI values vs length of unattended time. The RPI value for the maximum length of unattended time is by definition equal to the throughput because above this maximum the sum of unattended time is zero.
3, the labor productivity for the different immunoassay analyzers is expressed as RPI vs length of unattended time. Both the ACS:Centaur and Immulite 2000 appear to be labor-efficient analyzers, producing RPI values that were substantially higher than those of the other three analyzers over the whole range of unattended times.
[RPI.sub.(UT,aunt)] (a) ACS:Centaur Architect [RPI.sub.(O,aunt)] 22 800 1863 [RPI.sub.(5,aunt)] 3142 716 [RPI.sub.(10,aunt)] 1701 637 [RPI.sub.(20,aunt)] 736 266 [RPI.sub.(30,aunt)] 298 150 [RPI.sub.(40,aunt)] 242 130 Elecsys Immulite Vitros ECi [RPI.sub.(UT,aunt)] (a) 2010 tandem 2000 [RPI.sub.(O,aunt)] 433 1668 380 [RPI.sub.(5,aunt)] 364 1211 282 [RPI.sub.(10,aunt)] 235 964 223 [RPI.sub.(20,aunt)] 210 689 153 [RPI.sub.(30,aunt)] 174 400 114 [RPI.sub.(40,aunt)] 149 359 81 (a) UT, unattended time; aut, automated.
For these laboratories, long unattended times are of more importance than high throughput.