A 16-year-old pregnant adolescent has been treated for acute cystitis. To determine the effectiveness of therapy with nitrofurantoin (Macrobid), the nurse practitioner instructs the adolescent to return for a urine culture:

1-2 weeks after initiating the nitrofurantoin (Macrobid).

1 week after completion of nitrofurantoin (Macrobid) therapy.

after 10 days of nitrofurantoin initiation (Macrobid).

2 weeks after completion of nitrofurantoin (Macrobid) therapy.