and 3. Figure 2. Platelet enrichment in platelet-rich plasma (PRP) as a function of centrifugation time. Enrichment is expressed as the fold increase in platelet concentration over the whole blood sample from which the PRP was prepared. Note the great increase in concentration after 6 minutes. Although 6 minutes was found to have the highest fold increase in concentration, 10 minutes produced the most consistent results (SD = 1.49) out of all the times considered. WB = whole Blood; n = 7. Figure 3. Platelet enrichment in PRP as a function of bench set time. Centrifuged anticoagulated whole blood was allowed to set on the bench for up to 6 hours. The greatest variability occurred after 15 minutes, and it became more pronounced after 1 hour. The most effective time point was 0 minutes; it was noted as having the greatest concentration increase (7 × whole blood) with regard to consistency (SD = 370.99; n = 7).