Dr Anna Biddle was caught by a police camera as she drove at more than 50mph past crawling rush hour traffic on a 30 mph section of dual carriageway.
The 55-year-old GP was hurrying to help young mother Tina Randall, who had collapsed from chest pains at her home.
After emergency treatment Ms Randall, 30, was taken to the Royal Haslar Hospital in Gosport, Hants, where she died of a heart attack.
Despite phoning police later the same day to explain about the emergency, Dr Biddle now has the dilemma of paying a pounds 40 fixed penalty fine and having three penalty points added to her clean licence, or taking the case to court.
Dr Biddle, of Locks Heath, near Southampton, said: "Just before 8am I had a desperate call on my ansaphone saying a young woman had collapsed and I made the decision to just go.
"At that time in the morning an ambulance would have taken longer to get there and I have got emergency equipment in my car."
Hampshire police refused to comment on the case.