Source:http://linkedlifedata.com/resource/umls/id/C0005845
MSH: The urea concentration of the blood stated in terms of nitrogen content. Serum (plasma) urea nitrogen is approximately 12% higher than blood urea nitrogen concentration because of the greater protein content of red blood cells. Increases in blood or serum urea nitrogen are referred to as azotemia and may have prerenal, renal, or postrenal causes. (From Saunders Dictionary & Encyclopedia of Laboratory Medicine and Technology, 1984),NCI: A quantitative measurement of the amount of urea nitrogen present in a serum sample.,NCI: A measurement of the urea nitrogen in a blood specimen.