Reference intervals for platelet large cell ratio, platelet distribution width, plateletcrit and standard haematological parameters determined on the Sysmex XN-10 in a cohort of 30,917 Danish blood donors

With the introduction of the Sysmex XN-10, new platelet indices reflecting platelet maturity can be obtained alongside with a full blood count. Therefore, the need for verified reference intervals is present. The purpose of this study was to establish reference intervals for the platelet indices: platelet large cell ratio (P-LCR), platelet distribution width (PDW) and plateletcrit (PCT) in a large Scandinavian cohort. Furthermore, we aimed to verify previously established reference intervals of haematological parameters included in a full blood count. Blood samples were obtained from healthy Danish blood donors and analysed by use of the Sysmex XN-10 analyser (Sysmex, Kobe, Japan). Non-parametric 95% reference intervals were determined as the 2.5 and 97.5 percentile and presented with 90% confidence intervals (CI). In total, 30,917 blood donors were included and the following reference intervals were established: P-LCR, ratio: 17.3 (90% CI: 17.2 - 17.5) - 46.2 (90% CI:45.9 - 46.4); P DW, fL:9.5 (90% CI: 9.5 - 9.5) - 17.2 (90% CI: 17.2 - 17.3) and PCT, fraction: 0.18 (0.18 - 0.18) - 0.38 (0.38 - 0.39). The reference intervals were stable across age and sex. Furthermore, reference intervals for the remaining haematological parameters included in a full blood count were verified and found in line with the previously established reference intervals.