Gastroenterology

Gastroenterology

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CalvertHealth Gastroenterology

CalvertHealth Gastroenterology is your go-to destination for digestive health. Whether you suffer from chronic acid reflux or have severe abdominal pain, our board-certified providers have the skills and technology to diagnose and manage your gastrointestinal illness or disease.

At CalvertHealth Gastroenterology we are experts in all aspects of digestive and liver health. We diagnose and manage biliary disease, GERD, liver disease, cancers of the digestive tract including colorectal cancer, hepatitis and inflammatory bowel disease including Chrohn’s Disease and Ulcerative colitis. You should talk to a gastroenterologist if you suffer from any persistent or chronic abdominal pain, excessive bloating, belching or flatulence; have trouble swallowing; have recurrent heartburn or acid reflux, hemorrhoids or rectal bleeding, chronic nausea and/or vomiting.

CalvertHealth Gastroenterology is proud to be able to offer the residents of Southern Maryland Endoscopic Ultrasound (EUS) for the diagnosis and treatment of gastrointestinal disease and Fecal Microbiatia Transplant (FMT) to treat recurrent Clostridium difficile (c Diff) infection. Both procedures are performed at the CalvertHealth Endoscopy Department by board-certified gastroenterologist Dr. Saad Haque. You no longer have to travel to Baltimore, Annapolis or DC to receive these advanced techniques.

Other procedures we offer to diagnose and manage gastroenterological diseases include:

All our procedures (both diagnostic and curative) are performed in our office on the Medial Office Building, in the CalvertHealth Endoscopy Department or in the Same Day Surgery Department at CalvertHealth Medical Center.

CalvertHealth Gastroenterology treats diseases and disorders of the digestive system including conditions affecting the esophagus, stomach, liver, pancreas, bile ducts, intestines, colon, and rectum. Dr. Haque specializes in colon cancer screening and polyp removal.

You should seek out a Gastroenterologist if you experience any of the following on a regular or acute basis:

  • Abdominal pain
  • Bloating, belching and flatulence
  • Choking or trouble swallowing
  • Constipation or diarrhea
  • Heartburn or acid reflux
  • Hemorrhoids or rectal bleeding
  • Nausea and vomiting

Our Providers

Ann Chen, PA-C


Ann Chen is a Board Certified Physician Assistant (PA-C) specializing in Gastroenterology. She is a graduate of the Physician Assistant Program that was developed by the University of Wisconsin La Crosse, in partnership with the Gundersen Lutheran Medical Foundation of La Crosse and the Mayo Clinic College of Medicine.

Ann started her PA career in a busy OB/GYN clinic in Marshfield WI, working as the primary provider in the outpatient clinic and as the first assistant to five primary surgeons performing OB/GYN procedures as well as gynecologic oncology surgeries. A relocation prompted her moving from an OB/GYN setting to gastroenterology, where she had the privilege of studying under some of the country’s top physicians in the field.

While working for GI Associates in Milwaukee, WI, Ann worked with adult as well as pediatric patients on a wide range of GI disorders, including Chrohn’s disease/Ulcerative Colitis, GERD, celiac disease, IBS, cirrhosis, hepatitis and fatty liver disease.

Ann thrives in a clinical setting, taking the time to get to know her patients and their backstory. “I enjoy the clinical aspect of getting to know my patients on a personal level – something that isn’t always possible in an acute care environment like the operating room.”

Ann came to southern Maryland in 2011 and began working with Calvert Gastroenterology in 2012, where she continues to advance her skills. She was the first midlevel provider in Maryland and is still one of a very few in the county who specializes in Hemorrhoid Banding, a minimally invasive and non-surgical procedure to remove hemorrhoids.

As a Board Certified Physician Assistant, Ann is qualified to take medical histories, examine patients, order and administer tests, make diagnoses, treat illnesses, write prescriptions and assist in surgery.

Saad Haque, MD


Dr. Saad A. Haque is Board Certified in Internal Medicine, Hepatology and Gastroenterology. He did his residency in internal medicine at The Graduate Hospital, Drexel University College of Medicine in Philadelphia, and completed a fellowship in gastroenterology at Cooper University Hospital. While there, he received specialized training in Endoscopic Retrograde Cholangio-pancreatography (ERCP), a procedure used to identify and correct problems in the bile ducts and pancreas.

He continues to pursue advanced training and is certified to perform several key diagnostic and therapeutic procedures. "Technology is opening the door to incredible advancements in diagnosing and treating gastrointestinal diseases. It is very important to me to be able to offer these procedures and techniques to my patients here in Calvert and not make them go to Baltimore or DC."

Dr. Haque came to Calvert County to continue his work treating a wide range of GI disorders rather than limit his exposure to a small set of routine procedures which is often the case in more urban medical facilities. He specializes in colon cancer screening and polyp removal and is specially trained in Endoscopic Mucosal Resection (EMR), a technique used to remove large colon polyps non-surgically. He was one of the first physicians in the country to be trained and is still one of a very limited number of physicians in Southern Maryland to be trained to perform the technique. In addition to patients who come to him directly, Dr. Haque regularly receives referrals from local gastroenterologists for these difficult-to- treat colon polyps.

“Non- or minimally-invasive techniques such as endoscopy often have a better outcome than surgical procedures. They are easier on the patient, allow for quicker recovery and result in less scarring while providing excellent diagnostic and curative capabilities. I feel it is important for me to excel in as many of them as possible.”