Upper GI Series
On this page:
- What is an upper gastrointestinal (GI) series?
- What problems can an upper GI series detect?
- When is an upper GI series used?
- How to Prepare for an Upper GI Series
- How is an upper GI series performed?
- What is a double contrast study?
- Recovery from an Upper GI Series
- What are the risks associated with an upper GI series?
- Points to Remember
- Hope through Research
- For More Information
What is an upper gastrointestinal (GI) series?
An upper GI series uses x rays to help diagnose problems of the upper GI tract, which includes the esophagus, stomach, and duodenum. The duodenum is the first part of the small intestine.
What problems can an upper GI series detect?
An upper GI series can help detect
- abnormal growths
- scars or strictures—narrowings of the GI tract
- hiatal hernia
- diverticula—bulges in the wall of the esophagus or intestine
- esophageal varices—enlarged veins in the esophagus
When is an upper GI series used?
An upper GI series can be used to help determine the cause of
- abdominal pain
- swallowing difficulties
- gastroesophageal reflux—a condition in which food and digestive juices rise from the stomach into the esophagus
- unexplained weight loss
How to Prepare for an Upper GI Series
The upper GI tract must be empty prior to an upper GI series. Generally, no eating or drinking is allowed for 8 hours before the procedure. Smoking and chewing gum are also prohibited during this time.
Patients should tell their doctor about all health conditions they have—especially allergies to medications or foods—and about all medications they are taking.
Women should let their doctor know if they are pregnant. Developing fetuses are particularly sensitive to x rays. Special precautions can be taken to minimize exposure, or the doctor may suggest an alternate procedure such as upper GI endoscopy.
How is an upper GI series performed?
An upper GI series is conducted by a radiology technologist or a radiologist—a doctor who specializes in x–ray imaging—at a hospital or outpatient center.
While sitting or standing in front of an x–ray machine, the patient drinks barium liquid, which is often white and has a chalky consistency and taste. The barium liquid coats the lining of the upper GI tract and makes signs of disease show up more clearly on x rays. X-ray video, called fluoroscopy, is used to view the barium liquid moving through the esophagus, stomach, and duodenum.
Additional x rays and fluoroscopy are performed while the patient lies on an x-ray table. To fully coat the upper GI tract with barium liquid, the technologist or radiologist may press on the abdomen or ask the patient to change position. Patients hold still in various positions, allowing the technologist or radiologist to take x rays of the upper GI tract at different angles. If a technologist conducts the upper GI series, a radiologist will later examine the images to look for problems.
What is a double contrast study?
The double contrast study gets its name from the combination of air and liquid barium working together to create a more detailed view of the stomach lining. The patient swallows gas-forming crystals, which are activated when they mix with the barium liquid. The gas expands the barium-coated stomach, exposing finer details of the stomach lining, and additional x rays are taken.
Recovery from an Upper GI Series
Patients may experience bloating and nausea for a short time after an upper GI series. Not eating before the test and the test itself may cause one to feel tired. For several days afterward, barium liquid in the GI tract causes stools to be white or light colored. Unless otherwise directed, patients may immediately resume their normal diet once they leave the hospital or outpatient center.
What are the risks associated with an upper GI series?
Mild constipation from the barium liquid is the most common complication of an upper GI series. Rarely, barium liquid causes bowel obstruction, a life-threatening condition that blocks the intestines. Drinking plenty of liquids after an upper GI series flushes out the barium and helps reduce the risks of constipation and bowel obstruction.
Although infrequent, barium can cause an allergic reaction, which is treated with antihistamines. Some barium liquids contain flavorings, which may also cause an allergic reaction.
The risk of radiation-related damage to cells or tissues from an upper GI series is low. People who have recently undergone other x-ray tests should talk with their doctor about potential risks.
Patients who experience any of the following rare symptoms should contact their doctor immediately:
- severe abdominal pain
- failure to have a bowel movement within 2 days after the procedure
- inability to pass gas
Points to Remember
- An upper GI series uses x rays to help diagnose problems of the upper GI tract, which includes the esophagus, stomach, and duodenum.
- The upper GI tract must be empty prior to an upper GI series. Generally, no eating or drinking is allowed for 8 hours before the procedure. Smoking and chewing gum are also prohibited during this time.
- An upper GI series is conducted by a radiology technologist or a radiologist at a hospital or outpatient center.
- During the procedure, the patient drinks barium liquid and x-ray pictures and x-ray video, called fluoroscopy, are taken.
- After the procedure, patients may experience bloating and nausea and feel tired.
- Possible risks of an upper GI series include mild constipation, bowel obstruction, an allergic reaction to barium, and cell and tissue damage from radiation exposure.
Hope through Research
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) conducts and supports basic and clinical research into many digestive disorders.
Participants in clinical trials can play a more active role in their own health care, gain access to new research treatments before they are widely available, and help others by contributing to medical research. For information about current studies, visit www.ClinicalTrials.gov.
For More Information
Fact sheets about other diagnostic tests are available from the National Digestive Diseases Information Clearinghouse at www.digestive.niddk.nih.gov, including
- ERCP (Endoscopic Retrograde Cholangiopancreatography)
- Flexible Sigmoidoscopy
- Liver Biopsy
- Lower GI Series
- Upper GI Endoscopy
- Virtual Colonoscopy
Publications produced by the Clearinghouse are carefully reviewed by both NIDDK scientists and outside experts. This publication was reviewed by M. Brian Fennerty, M.D., Oregon Health and Science University.
National Digestive Diseases Information Clearinghouse
The National Digestive Diseases Information Clearinghouse (NDDIC) is a service of the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The NIDDK is part of the National Institutes of Health of the U.S. Department of Health and Human Services. Established in 1980, the Clearinghouse provides information about digestive diseases to people with digestive disorders and to their families, health care professionals, and the public. The NDDIC answers inquiries, develops and distributes publications, and works closely with professional and patient organizations and Government agencies to coordinate resources about digestive diseases.
Publications produced by the Clearinghouse are carefully reviewed by both NIDDK scientists and outside experts.
This publication is not copyrighted. The Clearinghouse encourages users of this publication to duplicate and distribute as many copies as desired.
NIH Publication No. 10–4335
Page last updated April 23, 2012