This is a clincial validation study of a dried blood spot (DBS) method for the analysis of immunosuppressive and antifungal agents currently subject of therapeutic drug monitoring (TDM) in a pediatric population. The primary goal is to clinically validate a finger prick DBS method compared to conventional venous sampling for the analysis of 5 immunosuppressive and 4 azole antifungal drugs in the pediatric population. Secondairy goals include feasibility of the finger prick DBS method in the target population, to design an inventory of costs that will be incurred in future health-economic analyses and to construct a population PK model based on the available data collected for the primariy goal.
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drug concentration
Timeframe: predose, 2 samples postdose, max 6 hours post dose