A simple technique for urea nitrogen:  the xanthydrol reaction evaluated.
D001769:Blood; D007202:Indicators and Reagents; D007674:Kidney Diseases; D009584:Nitrogen; D014508:Urea / Q000097:blood*; D014966:Xanthenes
D007202:Indicators and Reagents; D014966:Xanthenes; C009690:xanthydrol; D014508:Urea; D009584:Nitrogen
BLOOD; KIDNEYS/diseases; REAGENTS; UREA/in blood