Diagnosis of Meconium Aspiration Syndrome
If a baby is thought to have inhaled meconium, treatment will begin during delivery. If the baby has trouble breathing, the doctor will insert a laryngoscope into the trachea to remove any meconium. The doctor also will listen to the baby's lungs to check for sounds that are common with MAS.

The doctor might order tests, such as a blood test (called a blood gas analysis) that helps determine if the baby is getting enough oxygen and a chest X-ray that can show patches or streaks on the lungs that are found in babies with MAS.