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About Independent Gastroenterology of New Jersey

We are an independently operating gastroenterology group comprising seven board-certified physicians in gastroenterology.

With eight conveniently located offices in central New Jersey, including New Brunswick, East Brunswick, Somerset, Edison, Englishtown, and Cape May, we strive to fulfill our mission of empowering gastroenterologists to deliver compassionate, high-quality, and comprehensive care through an unparalleled patient experience.

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Breath Testing

A breath test is a non-invasive test that can help diagnose a variety of gastrointestinal disorders and diseases, such as lactose intolerance, fructose intolerance, Helicobacter Pylori infection of the stomach, and small intestinal bacterial overgrowth.

Colonoscopy

A colonoscopy is now the gold standard used to detect or prevent individuals from getting colon cancer. Adults starting at age 45 years are strongly recommended to have a colonoscopy or some other test to screen for colon cancer.

Flexible Sigmoidoscopy

A sigmoidoscopy is an internal exam of the lower part of the large intestine (colon) using a short, thin, flexible, lighted tube with a camera at the tip. This procedure helps determine the cause of abdominal pain, rectal bleeding, changes in bowel habits, chronic diarrhea, and other intestinal problems.

Lactose Intolerance Breath Test

Lactose breath testing is a test which measures the amount of hydrogen released in breath as a result of the indigestion of lactose. Higher the hydrogen values, poorer the digestion of lactose.

Percutaneous Endoscopic Gastrostomy (PEG)

Percutaneous Endoscopic Gastrostomy (PEG) is a procedure where physicians use an endoscope to insert a plastic flexible feeding tube through the upper abdominal wall directly into the stomach.

Upper Endoscopy

An endoscopy is a very common and safe procedure that is used to examine the esophagus, stomach, and upper part of the small intestine, known as the duodenum, to get a closer look at what may be causing symptoms.

Celiac Disease

Celiac disease is an autoimmune disease where a patient’s immune system abnormally responds to the ingestion of gluten. It is estimated that 1 in 100 people worldwide is affected by celiac disease. However, up to 2.5 million people in the United States may have celiac disease and not know it, as the symptoms range from mild to severe.

Constipation

Constipation is defined as having a bowel movement fewer than three times per week. With constipation, stools are usually hard, dry, small in size, and difficult to eliminate. Some people who are constipated find it painful to have a bowel movement and often experience straining, bloating, and the sensation of a full bowel.

GERD

Gastroesophageal reflux disease (GERD) is a more serious form of gastroesophageal reflux (GER) which is common. GER occurs when the lower esophageal sphincter (LES) opens spontaneously, for varying periods of time, or does not close properly, and stomach contents rise up into the esophagus.

Hemorrhoids

Hemorrhoids are swollen veins in the anal canal. This common problem can be painful and can be caused by too much pressure on the veins in the pelvic rectal area. Normally, tissue inside the anus fills with blood to help control bowel movements, but if you strain or sit on the toilet a long time to move stool, the increased pressure causes the veins in this tissue to swell and stretch.

Inflammatory Bowel Disease + Crohn's Disease & Ulcerative Colitis

Inflammatory bowel disease (IBD) encompasses a set of gastrointestinal diseases where parts of the digestive tract are chronically inflamed by a dysfunctional interaction immune system. Hereditary factors and an abnormal interaction between microorganisms and the immune system are felt to play a role.

Irritable Bowel Syndrome

It is estimated that 10 to 15 percent of Americans have Irritable Bowel Syndrome (IBS). IBS is a functional GI disorder that refers to a group of symptoms that affect the digestive tract, often resulting in abdominal pain, bloating, or cramping. However, some people with IBS have no symptoms at all.

What Our Patients Say About Us

I had great experience.... very informative staff made me feel comfortable... Doctor Nahar was very patient with me and explained all the procedures I would definitely recommend this doctor to others ... thank you for helping me.
Marilyn C.
Marilyn C.
Love love Dr Kastuar! His officer staff is always pleasant and willing to help. Dr Kastuar stays on top of all the newest medical modes and I feel very confident with him.
Linda S.
Linda S.
Dr. Yuri Volk is a doctor par excellence. Compassionate, caring, trusting, knowledgeable, and always goes the extra mile without asking. The best way to describe what I feel about the doctor is to say that I wish "all doctors were like Dr. Volk"
Anonymous
Anonymous
Dr. Pickover was thoughtful, kind, gently, thorough in exam and all explanations. He took his time to explain things to me and answered every question. I’d recommend him in a heartbeat.
Susan M.
Susan M.
I have been using Dr. Steven Krawet for many years. I find him understanding, compassionate and extremely professional. If you want a really wonderful physician I strongly recommend Dr. Krawet.
Anonymous
Patient Testimonials
Dr Nahar was very friendly. She was able to explain the cause of my symptom and what to do to help my situation. All my questions were answered. I will be scheduling a follow up appointment in the near future.
Anonymous
Patient Testimonials
Dr. Kastuar truly cares about the well-being of his patients. He has demonstrated quick availability to me as a patient and as a family member. He has always been thorough, professional, and kind to me and my family! I feel comfortable that he is exceptionally competent in his knowledge and treatment.
Maria O.
Patient Testimonials
Dr Volk is very knowledgeable, friendly, compassionate, and takes the time to answer any questions. In my experience he will always go an extra mile to help his patients and give them a comprehensive understanding of their conditions and outlook. I would recommend him to anyone I know.
Yuliana
Patient Testimonials
Dr Pickover has been my families (mother, father, brother, husband and myself) doctor for over 25 years. He is kind and knowledgeable. I would recommend him highly to anyone that needs a gastro doctor.
Annette F.
Patient Testimonials
Dr Krawet is a great doctor, does NOT rush you out, answers all you questions. Makes sure you understand everything before leaving. Has a great staff very compassionate, never a long wait.
Pat L.
Patient Testimonials
Dr Troum and his attentive and friendly staff made a colonoscopy pleasurable. Dr Troum came recommended and for good reason. Highly recommend!
Thomas D.
Patient Testimonials

Blogs

ADH_How-IBS-Affects-Men
Gender

How IBS Affects Men

Understanding these gender-specific patterns can help men recognize male IBS symptoms, manage their condition, and know when to seek help from a healthcare provider.

Read More »
February 19, 2026

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Choose a Provider

Dr. Krawet
Dr. Volk
Dr. Pickover
(Associated)
Dr. Troum
(Cape Atlantic)
Dr. Ritu Nahar / Dr. Sudha Nahar (Gyan)
Dr. Kastuar
(North Brunswick)