Problem: The nurse practitioner (NP) is screening a 1-week-old newborn for congenital heart defects (CHDs) and measures 91% oxygenation in the right hand and 95% in the left hand. The NP will: Need Professional Help? A. Order an echocardiogram. B. Evaluate for hypoxemia. C. Repeat screen in 1 hour. D. Schedule a 3-month follow-up appointment.