Kidney function testsWith increased fluid intake (dilution testing), osmolality should be less than ... clearance levels decrease, blood levels of creatinine and urea nitrogen increase. ... Basic Blood Chemistry TestsWhen potassium levels are too high or too low, it can increase the risk of an ... blood substances measured in the basic blood chemistry test include blood urea ... Blood Urea Nitrogen... much urea nitrogen remains in the blood can be used as a test of ... An increase in the BUN level is known as azotemia. An elevated BUN may be caused by: ... BUN Blood Test | Blood Urea Nitrogen... or a diet high in protein can also increase the BUN level. ... Blood Test. STD Testing. Laboratory Tests. C-site seal © Copyright 2003-2008 Lab-Safe, Inc. ... Urea definition - Medical Dictionary definitions of popular medical ...... to increased blood levels of urea, as measured by the blood urea nitrogen (BUN) test. ... Signs | Procedures & Tests | Medications | Health & Living ... |