UA stands for urinalysis.
Leuk Est U stands for leukocyte esterase. Leukocyte esterase is a urine test to look for white blood cells and other signs associated with infection. Leukocyte esterase is a screening test used to detect a substance that suggests there are white blood cells in the urine, which may mean you have a urinary tract infection. This test is part of the routine urine dipstick test. If this test is positive, the urine should be examined under a microscope for white blood cells and other abnormalities associated with infection.