Final answer:
Leukocyte esterase is the finding in a urinalysis that indicates a urinary tract infection, as it is an enzyme released by leukocytes which are present during an infection. The answer is option D.
Step-by-step explanation:
The finding in a urinalysis that indicates a urinary tract infection is leukocyte esterase. Urinalysis is a commonly used tool to screen for a potential urinary tract infection (UTI). The presence of leukocyte esterase in the urine suggests the presence of leukocytes, more commonly known as white blood cells.
Leukocyte esterase is an enzyme produced by leukocytes and can be detected in the urine; it is released when leukocytes are active, which usually occurs as part of an immune response to a urinary tract infection. A positive leukocyte esterase test is often followed by a urine culture to confirm the presence of a bacterial infection and to help guide appropriate antibiotic treatment.