Final answer:
The test for urea nitrogen in the kidneys is known as the blood urea nitrogen (BUN) test, which measures the concentration of urea in the blood to assess kidney function. Normal BUN levels range from 8 to 20 mg/dl.
Step-by-step explanation:
The test for urea nitrogen in the kidneys is commonly referred to as the blood urea nitrogen (BUN) test. This test measures the urea concentration in the blood, a water-soluble and non-toxic form of ammonia.
Normal BUN levels range from 8 to 20 mg/dl, and urea levels from 15 to 40 mg/dl in the blood. High levels of BUN can indicate impaired kidney function or kidney disease, while low levels may suggest liver issues.
For the estimation of blood urea, there are a few methods available, such as the Diacetyl Monooxime (DAM) method, the Colorimetric method, which uses the urease enzyme, and the Autoanalyser method.
Furthermore, the urea clearance test, which measures the volume of plasma that would be completely cleared of urea by one minute's excretion of urine, is another important assessment for kidney function.
A variety of urine and blood tests, including the BUN test, play a crucial role in diagnosing kidney disorders.
If a routine urinalysis indicates potential problems, further tests like BUN and creatinine levels will be considered to assess kidney health more precisely.