Final answer:
A urinary tract infection (UTI) can be diagnosed in an old man with bloody urine through symptom evaluation and urine tests. Symptoms include bloody urine, pain during urination, frequent urination, and fever. A positive urine test result for white blood cells, red blood cells, and bacteria confirms the diagnosis.
Step-by-step explanation:
A urinary tract infection (UTI) in an old man with bloody urine can be diagnosed by a healthcare professional through a combination of symptoms evaluation and urine tests. Symptoms of UTI may include bloody urine, pain or burning sensation during urination, frequent urination, and fever. A urine sample will be collected and analyzed for the presence of white blood cells, red blood cells, and bacteria. A positive test result along with the symptoms is indicative of a UTI.