Diagnosis of Persistent Pulmonary Hypertension in the Newborn
Your baby’s healthcare provider will check his or her health and delivery history. Then he or she will give your baby an exam. Your child’s healthcare provider may do the following tests to diagnose PPHN:

Chest X-ray. This can show certain problems with the lungs or heart.

Blood tests
Oxygen level checks. Your baby’s oxygen levels will be checked at different spots on his or her body. Your child’s healthcare provider will compare these levels to check if blood is being circulated to your baby’s lungs.

Echocardiogram. This is an ultrasound picture of the heart and blood vessels. The healthcare provider uses this to look at different body structures and to measure the blood pressure in different areas.