One common example: ­Patients who zealously follow the usual instruction to have "nothing to eat or drink the night before" can end up with high blood urea nitrogen (BUN), which assesses kidney ...

The use of blood urea nitrogen (BUN) concentration as a measure of renal function is even less reliable, because BUN levels can be affected by the presence of gastrointestinal bleeding or by the ...

These creatures consume blood as a main part of their diet, even though blood generally isn’t all that nutritious. Blood is ...

Blood is transported to the kidney through the renal artery. The blood is filtered at a high pressure and the kidney selectively reabsorbs any useful materials such as glucose, salt ions and water.