doctor's certificate
noun[C]
HR,WORKPLACEukusaletterfrom adoctorsaying that someone is tooilltowork, or that they are well enough to do aparticularjob:
You will need a doctor'scertificateif you areabsentfor more than threedays.
Pregnantworkersdo not have to donightworkif they have a doctor'scertificatestatingthat suchworkwouldendangertheirhealth.
Drivers over 65 mustpresenta doctor'scertificatesaying they arefittodrive.