Exams and Tests

Pyloric stenosis is diagnosed by a physical exam and your baby's medical history and symptoms. An upper gastrointestinal (UGI) series or an abdominal ultrasound can be used to diagnose pyloric stenosis.

During the physical examination, the doctor will check your baby's abdomen for:

• A wavelike motion shortly after feeding and before vomiting.
• An olive-sized lump between the stomach and the intestine. Your doctor feels for this lump in the upper part of your baby's belly.

The doctor will also examine your baby for signs of dehydration. Blood tests may be done to check for dehydration.