Gastroenterology Tulsa, OK

Cutting-Edge Treatments for GI Conditions

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Patient-Focused Gastroenterology Care

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Gastroenterology Services and Treatments in Tulsa

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Find Your Local Gastroenterologist

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Hundreds of happy patients

Dr. Nightengale was very thorough, not rushed and he communicated well. He is very knowledgeable and he has earned my trust.

A.S. Google

Dr. Volak and one of his staff, Candy Williams, are the greatest.

W. Google

Very knowledgeable and friendly

C.C. Google

This is a first class facility. All the staff are very professional, friendly and helpful. I would recommend DR Kliewer and his staff to anyone.

D.H. Google

TThey are so organized. No long wait and the Dr. explained everything in a way I could understand. They have the best system in getting patients seen and out the door quickly.

R.G. Google


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Whether you have been diagnosed with a GI condition and are struggling to find the right treatment or you are experiencing uncomfortable GI symptoms that you can no longer manage alone, we are here to help. At Adult Gastroenterology Associates, you come first. You do not have to try and manage uncomfortable abdominal pain, nausea, or constipation alone. Our Tulsa provider-led group of gastroenterologist specialists are dedicated to ensuring that you receive the best care possible.

About Us

A colonoscopy is a life-saving procedure that is used to diagnose, treat, and prevent a number of diseases of the large intestine, such as colon cancer. The GI providers at Adult Gastroenterology Associates are passionate about keeping their Tulsa patients in optimal health. Whether you are having a colonoscopy to screen for colon cancer or you are searching for the cause of your stomach pain, a quick 15 – 30 minute colonoscopy could give you the answers you are searching for.

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If you are experiencing uncomfortable GI symptoms like chronic diarrhea, abdominal pain, or bloody stools, you are not alone. More than 1.6 million Americans suffer from an inflammatory bowel disease (IBD). Our providers routinely diagnose, treat, and manage IBD conditions in Tulsa patients. Allow the providers at Adult Gastroenterology Associates to help you take your life back.

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