Shanthi Dhaduvai, MD, is board-certified in rheumatology with Ascension St. Vincent's in Orange Park, FL. Dr. Dhaduvai provides specialty care for rheumatic diseases, such as rheumatoid arthritis and inflammatory diseases in children and adults. Our care team provides lab tests and ultrasound imaging to analyze joint fluid imbalances. We offer genetic testing of the PTPN22 gene. This test helps identify if you have an inherited gene for developing rheumatoid arthritis.