Nouns

(n)follow-up, followupa piece of work that exploits or builds on earlier work“his new software is a follow-up to the programs they started with”
(n)follow-up, followupan activity that continues something that has already begun or that repeats something that has already been done
(n)follow-up, followup, reexamination, reviewa subsequent examination of a patient for the purpose of monitoring earlier treatment