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Request a sickness certificate. NHS sickness certification is provided only after seven continuous days of illness. For the first seven days, complete a Self Certification SC2 form, available from your employer or the HMRC website. After this period, a NHS certificate may be issued, and you may need to contact the surgery to discuss your request with your GP. If you need to extend your sick note or have been absent from work for more than seven days, submit your request online.