Gastrointestinal Care of Long Island is a gastroenterology practice serving patients in Nassau County. Its team, including Dr. Herbert Pasternak, DO, FACOI, and board-certified Family Nurse Practitioner Avigail Itzkowitz, combines medical care with diagnostic technology to address gastrointestinal and liver conditions and support colorectal cancer prevention, detection, and screening. The practice emphasizes professional, personal, and compassionate care, with attention to patient comfort and satisfaction.

Services include colonoscopy, upper endoscopy, capsule endoscopy, ERCP, flexible sigmoidoscopy, hemorrhoid treatments, and in-office FibroScan testing. FibroScan is a non-invasive way to assess liver tissue elasticity and detect fibrosis, with results available in real time to help guide treatment recommendations. The practice also provides information and care related to conditions such as celiac disease, constipation, GERD, hemorrhoids, inflammatory bowel disease, Crohn’s disease, ulcerative colitis, and irritable bowel syndrome. Nutrition resources are available to help patients understand how diet can support digestive health. Patients can access appointment booking, forms, preparation instructions, insurance and billing information, and a patient portal.