She performed the first mammogram in Australia at the Rachel Forster Hospital and demonstrated the benefits of mammography as a breast cancer screening tool.
She graduated in 1925 and was hired as a resident medical officer at the Royal Prince Alfred Hospital, where she worked in the radiology department.
After marrying Harold McCredie, a general practitioner, in 1928, she established a radiological practice based out of their home in Campsie.
[1] She also continued to work at the Rachel Forster Hospital, where Kathleen Cuningham had established a clinic for the diagnosis and treatment of breast lumps.
[2] Australia adopted a national breast cancer screening program three decades after Dalgarno's work on mammography.