Why “Urea Nitrogen” When Urea is Measured?

Blood Urea Nitrogen

Loop diuretics are used in patients with heart failure (HF) to relieve symptoms of systemic and pulmonary venous congestion. Despite their nearly universal use for this indication, loop diuretics have not been shown to improve survival—indeed, a number of recent studies suggest an adverse relationship between the use of loop diuretics and survival (1–3). This is plausible because loop diuretics...

Milk Urea Nitrogen Testing

Relationship among Concentrations of Milk Urea Nitrogen and Plasma Urea Nitrogen and Feeding Time

Eight Holstein cows were used to determine the relationship among milk urea nitrogen (MUN), plasma urea nitrogen (PUN), and feeding time. We first established that MUN concentrations were similar in concentration among quarters by comparing milk samples from each quarter just before milking. In order to determine if collecting a sample of milk from a quarter influenced the MUN in samples taken ...

Salvage of urea-nitrogen and protein requirements.

The metabolism of N in the colon is dominated in quantitative terms by the metabolic activity of the microflora. The microflora are not found exclusively in the colon, as there are increasing numbers in the terminal ileum towards the ileocaecal valve; however, the working approximation is that functionally significant activity is colonic. There is a complex, and as yet inadequately defined, int...

Where Is Urea Formed?

Toe above question is asked by Dr. M. Poster in the last edition of his text-book of physiology, and as the weight of evidence appears to favour the idea that the liver is the chief organ concerned in producing these changes in the products of decomposition of nitrogenous matter resulting in the formation of urea, I would feel obliged by your publishing the following observations, which appear ...