Question: How do doctors diagnose Hirschsprung disease?
Answer: Doctors diagnose Hirschsprung disease by taking a medical and family history, doing a physical exam, and ordering tests.

Although Hirschsprung disease develops before birth, doctors cannot diagnose the disease until after an infant is born. About half the people with Hirschsprung disease are diagnosed in their first year of life.9,10 About 80% of people with Hirschsprung disease are diagnosed by age 7, and more than 90% are diagnosed by age 13.9,10

If your child’s doctor suspects your child might have Hirschsprung disease, he or she may refer your child to a pediatric gastroenterologist—a doctor who specializes in digestive diseases in children—or a pediatric surgeon.

Medical and family history

To diagnose Hirschsprung disease, a doctor will start by asking about your child’s medical and family history. The doctor will also ask about your child’s symptoms and when the symptoms began.

Physical exam

During a physical exam, a doctor typically

reviews your child’s height and weight
examines your child’sabdomen—or belly—for swelling
performs adigital rectal exam—having nostoolin therectumor having explosive stool after a rectal exam may be signs of Hirschsprung disease
Question: What tests do doctors use to diagnose Hirschsprung disease?
Answer: Doctors use a combination of imaging tests, anorectal manometry, and rectal biopsies to diagnose Hirschsprung disease.

Imaging tests

To check for signs of Hirschsprung disease, doctors may use imaging tests such as lower GI series, or contrast enema, which uses x-rays and barium or water-soluble contrast medium to view the large intestine.

Anorectal manometry

Anorectal manometry is a test that checks how well your child’s rectum is working. During the procedure, the doctor inflates a small balloon inside your child’s rectum. Normally, the muscles in the rectum will relax. If the muscles don’t relax, the doctor may suspect your child has Hirschsprung disease.

Rectal biopsy

Doctors typically use rectal biopsies to confirm or rule out a diagnosis of Hirschsprung disease. During a rectal biopsy procedure, a doctor will take small pieces of tissue from the rectum. A pathologist will examine the tissue under a microscope to look for signs of Hirschsprung disease.

Two types of rectal biopsy are

rectal suction biopsy, in which a doctor inserts a small instrument into a child’s anus to take small pieces of tissue from the lining of the rectum
full thickness rectal biopsy, in which a doctor performs surgery to remove a thicker piece of tissue from the rectum