Ablood test that analyzes the ability of the kidneys to perform their function is the

Answer; 
BUN (Blood Urea Nitrogen) test.

A blood test that analyzes the ability of the kidneys to perform their function is the BUN test (Blood Urea Nitrogen test)

Explanation; 
BUN test is a common test that reveals the important information about the performance of the kidney and also the liver. It is important in the evaluation of the kidney in several occasions; to help diagnose kidney disease, monitor people with acute or chronic dysfunction or failure. 

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.