MacArthur Gastroenterology brings 40+ years of clinical expertise together with physician-supervised programs for fatty liver screening and medical weight management.
From routine colonoscopy and endoscopy to complex GI conditions, our physicians provide diagnostic and therapeutic care across the full range of digestive health.
EGD is an outpatient procedure using a flexible video endoscope to examine the esophagus, stomach, and duodenum. Performed by Dr. Peterson, it gives a clear, direct view of the upper digestive tract.
Flexible sigmoidoscopy uses a thin, flexible scope with a light and camera to examine the rectum and lower (sigmoid and descending) colon. Learn more from the National Institute of Health (NIH).
Colonoscopy uses a flexible fiber optic scope to examine the full colon, from the cecum to the descending colon. Dr. Peterson’s scoping expertise makes this exam both thorough and life-saving.
A quick, non-invasive Velacur® scan detects fatty liver disease and liver stiffness in minutes, no needles, no prep required.
Physician-supervised programs, including GLP-1 therapy when appropriate, designed around your metabolic health and monitored by our clinical team.
Dr. Peterson has served the Oakland community for over four decades, combining deep clinical experience with a personal, unhurried approach to every patient relationship.
Practical guidance on gastroenterology, fatty liver disease, and physician-supervised weight loss, written by our clinical team.
October is National Liver Awareness Month. Dr. Ralph Peterson explains why fatty liver disease often goes unnoticed, who should ask about screening, and four everyday habits that support your liver.
GLP-1 medications don’t just suppress appetite. Here’s what the research shows about how they actually change hunger, fullness, and blood sugar.
A look inside a physician-supervised weight management program, what your first evaluation covers, and where medication fits into the bigger plan.
MASLD is the new name for fatty liver disease, and it’s far more common than most people realize. Here’s what it is and why catching it early matters.
Our advanced liver scan is FDA-cleared imaging technology used at MacArthur Gastroenterology. Here’s how it works and what your results actually mean.
MacArthur Gastroenterology is launching two new physician-led programs addressing two of the most common, and most overlooked, metabolic health conditions.