What happens when pupils test positive for Covid-19? 10 March 2021What was claimed Children should not return to school after a positive lateral flow test, even if they receive a negative follow-up PCR test result. Pupils should only have a follow-up PCR test if they get a positive lateral flow result at home. As schools reopen this week, there has been some confusion about what parents should do if their children test positive for Covid-19. It says that in all circumstances where a pupil tests positive for Covid-19 they should isolate in line with public health guidance.