Merriam-Webster's Collegiate® Dictionary, 11th Edition
FOLLOW-UP
I. noun
Date: 1916
1. the act or an instance of following up, something that follows up, maintenance of contact with or reexamination of a person (as a patient) especially following treatment, a news story presenting new information on a story published earlier,
II. adjective
Date: 1912
of, relating to, or being something that follows up , done, conducted, or administered in the course of following up persons