She is board certified in both general pediatrics and pediatric infectious diseases. Gidengil trained as a resident in pediatrics at Hasbro Children's Hospital and Brown University. She completed further training in pediatric infectious diseases at Boston Children's Hospital and Harvard Medical School, where she joined the division as faculty in 2009. Her research training includes the Harvard Pediatric Health Services Research Fellowship Program. Gidengil earned her M.P.H. in clinical effectiveness from the Harvard School of Public Health and both her B.Sc. in psychology and M.D. from McGill University.