Follow up is used with these nouns as the object:
clue, discussion, reference, sighting

long-term
immediate, quick
six-month, two-year, etc.
regular
proper

need, require
plan
write
She is writing a follow-up to her best-selling novel.

period
action, work
After the report, advisers are expected to carry out follow-up work.

discussion, interview, meeting, session
questionnaire
assessment, evaluation
appointment
visit
You will receive a follow-up visit from the person conducting the assessment.

care, treatment
They were attending hospital for follow-up treatment.

report, study, survey
a long-term follow-up study of all children born in Great Britain in one week

article, story
data, information
question
call, email, letter
Always make a follow-up telephone call.

follow-up to
We are planning a follow-up to today's event.

Follow-up is used with these nouns:
appointment, article, assessment, call, exam, examination, interview, meeting, questionnaire, report, session, survey, treatment, visit, work