Hours of Operation Mon-Fri: 7:30 a.m. – 8:00 p.m. Sat: 7:30 a.m. – 4:00 p.m. *Sun: 7:30 p.m. – 4:00 p.m. 1-800-258-4674 Services: 1.5T MRI, Arthrograms MRI Tax ID: 02-0501695 *most Sundays   Address: Shields MRI Portsmouth 1900 Lafayette Rd. Portsmouth, NH 03801 Get directions from Go Unable to find any directions.