follow-up (n.)a piece of work that exploits or builds on earlier work;
his new software is a follow-up to the programs they started with
Synonyms: followup
follow-up (n.)an activity that continues something that has already begun or that repeats something that has already been done;
Synonyms: followup
follow-up (n.)a subsequent examination of a patient for the purpose of monitoring earlier treatment;
Synonyms: followup /
reexamination /
review 