Abstract Urea cycle disorders (UCDs) are a group of rare conditions. possibly life-threatening and without definitive cure besides liver transplantation. Traditional biochemical analyses/biomarkers cannot reliably determine changes in the UC-function from baseline to post-intervention. We describe a UHPLC-HRMS method to assess ureagenesis in plasma and dried blood spots for [15N]urea ... https://proozya.shop/product-category/gift-card/