"His skin was translucent, and that's when I said I've only seen someone look like this color once in 25 years. Prove me wrong," Butler told CBS.
But she wasn’t wrong. She suspected leukemia, and Nathan was soon diagnosed with the deadly cancer.
The boy’s mother, Nicole Defeo Campbell, credited the nurse with saving her son’s life.
“If she hadn’t called us, we would not be standing here talking about Nate today,” she said.
After treatment for leukemia, Nathan is now in remission, and his mother has nominated Butler for the America's Greatest School Nurse contest, But the nurse said she just wants the little boy to recover.