An evaluation of the urograph method for blood urea nitrogen estimation.

Analysis of blood urea nitrogen (BUN) on 160 sera by Urograph and autoanalysis revealed excellent correlation if the results of the Urograph method were reported in one of three ranges: under 20 mg. %, between 20 and 50 mg. %, and over 50 mg. %. Because of the simplicity of the Urograph method, it is suggested that this procedure should be useful for night, weekend and emergency analyses, or possibly for mass screening of BUN levels where automated equipment is not available.