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About Us


We are a group of five physicians. We have a total of 3 APP’s (Advanced Practice Practitioners) 2 of which are PA’s (Physician Assistant) and one who is a NP (Nurse Practitioner) providing experienced high-quality medical care for patients with disorders of the gastrointestinal tract, liver and pancreas. Our physicians are all Board Certified in Gastroenterology. Our physicians, physician assistants, and staff are proud to offer friendly, courteous, and knowledgeable care close to home. We are dedicated to treating each patient as an individual.

We hope that this website will help you to get to know our practice and provide helpful information on gastrointestinal disorders and endoscopic procedures. Please feel free to contact us to make an appointment at (603) 432-8802.

What we do

Our Services

From gastroesophageal reflux to colonoscopy, Granite State Gastrointestinal Consultants is equipped to handle all of your gastroenterology needs. To help you understand your options, we’ve included descriptions of some of our leading services.


•  Colon cancer screening
•  Removal of polyps
•  Treatment of rectal bleeding

Gastrostomy tube (P.E.G.) placement

BRAVO PH probe study

•  Evaluation of acid reflux symptoms

Management of Liver and Pancreas disorders

Expertise in Inflammatory Bowel Disease

•  (Crohn’s Disease and Ulcerative Colitis)

Diagnosis of anal/rectal conditions

Upper Endoscopy

•  Diagnosis and treatment of internal bleeding
•  Evaluation and management of ulcer disease
•  Evaluation of acid reflux (GERD)
•  Dilation of esophageal stricture or ring
•  Diagnosis and monitoring of Barrett’s Esophagus

Capsule Endoscopy

•  Pill cam evaluation of the small bowel

Treatment of Hepatitis C

Treatment of Irritable Bowel Syndrome

Evaluation of swallowing disorders


Patient Stories

Trip to Health Worth Taking

When you find a good doctor, it makes the trip from Maryland to New Hampshire worth taking.

In addition to other health issues, George Sneed has ulcerative colitis. When active, it’s extremely debilitating. “Ulcerative colitis can have a major impact on a patient’s life. Many patients with this condition can appear well, but they may be struggling with frequent trips to the bathroom,” said Dr. Leon McLean at Granite State Gastroenterology in Derry. 

Trust Keeps Him Coming Back

William Shakespeare once said, “Men of few words are the best men.

Granite State Gastroenterology patient John Moody, 75, of Derry, would certainly agree when it comes to Dr. Knut Roalsvig. “He’s a man of few words, but every word is important and means something,” said Moody. “Dr. Roalsvig asks a lot of questions, listens, takes copious notes, and is very thoughtful. You can almost see his brain working. He doesn’t let anything get by.”