Final answer:
A urinalysis should be ordered to confirm Cindy's diagnosis, as it checks for signs indicative of a UTI. If positive, a urine culture may follow to pinpoint the bacteria and suitable antibiotic treatment.
Step-by-step explanation:
The appropriate test that should be ordered to confirm Cindy's diagnosis, given her symptoms of frequent urination, a burning sensation, and blood in the urine, is urinalysis (Option A). Urinalysis is a common initial test to check for the presence of white blood cells, red blood cells, and bacteria, which can indicate a urinary tract infection (UTI). If the initial urinalysis suggests an infection, a urine culture (Option B) may be done to identify the specific bacteria causing the infection and to determine the most effective antibiotic treatment. Options C, D, and E are not the most appropriate initial tests for these symptoms. However, in certain cases, further imaging such as ultrasound abdomen (Option D) or a CAT scan (Option E) may be warranted based on the patient's history and clinical findings.