Simple Method of Improving the Quality of Platelet Concentrates and the Importance of Production Control

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Abstract
Some technical improvements of the method to prepare platelet concentrates (PC) have been developed. The contamination of the PC with red blood cells (RBC) and white blood cells (WBC) is thereby kept at a low level. A majority of routinely prepared PC did not show any visible RBC contamination which means that they contained less than 0.4 × 109 RBC per PC unit. None of the tested examples contained more than 1 × 109 RBC per PC unit. The WBC contamination was less than 0.1 × 109 cells per PC unit in 75 per cent of tested examples and did not exceed 0.6 × 109 cells per PC unit. Routine platelet counting by thrombocounter applied on samples from all PRPs was found to be a reasonably simple way to make routine PC quality control. By sufficient supervision of the details of the procedure the main yield can be maintained at about 100 × 109 cells per unit. By follow‐up of the weekly yield any deterioration of production efficiency can easily be detected.