Dr. Sandstrom graduated with a Bachelor of Science from McGill University of Montreal, Providence Quebec, Canada in 1968. Dr. Sandstrom completed medical school at the University of Washington, Seattle in 1971.

He completed a rotating internship at Toronto General Hospital and Toronto’s Sick Children’s Hospital. Dr. Sandstrom completed a residency in Anatomic and Clinical Pathology at Massachusetts General Hospital in Boston, Massachusetts. He concurrently served as a Clinical Fellow on the faculty of Harvard Medical School. He completed a fellowship in Dermatopathology under the direction of Dr. Martin Mihm at Massachusetts General Hospital in Boston, Massachusetts.

Dr. Sandstrom is board certified in Anatomic and Clinical Pathology. He also is certified in Immunohematology and Blood Banking. He holds joint board certification in Dermatopathology from the American Board of Dermatology and American Board of Pathology. Dr. Sandstrom is an active staff member of St. John's Medical Center, Longview, Washington, and consulting staff member at Providence Hospital, Centralia, Washington, Morton General Hospital, Morton, Washington, Ocean Beach Hospital, Ilwaco, Washington and Columbia Memorial Hospital, Astoria, Oregon.

He is licensed in Washington and Oregon.