Final answer:
The most important way to see if diuretic therapy is working is by monitoring urine output. Checking blood pressure and assessing edema can also be helpful.
Step-by-step explanation:
The most important way to see if diuretic therapy is working is by monitoring urine output. Diuretics work by increasing urine production, so if the therapy is effective, the patient should have an increased amount of urine. Checking blood pressure is also important, as diuretics are often prescribed to treat hypertension. Assessing edema can also be helpful, as diuretics are used to reduce fluid retention and swelling.