A bio scan analysis was a medical scan performed on patients.
In 2371, Tom Paris underwent a bio scan analysis in sickbay after he regained consciousness (VOY: "Ex Post Facto") and later that year, when he underwent an examination by The Doctor. (VOY: "Cathexis")
In 2374, a bio scan analysis was displayed on the biofunction monitor in sickbay aboard the USS Voyager. (VOY: "Scientific Method")