The testsamples are prepared from pooled blood samples from real patients and consist of erythrocytes. The separate samples of which the pooled sample exist have already been analyzed for routine thiupurines TDM purposes.
Participants are requested to determine 6-MMP and 6-TGN in two samples four times per year.
Because of stability problems samples are send on dry ice. Shipment will be done in March. The extra costs for shipment on dry ice will be charged to the participants.
For prices see: www.skml.nl.