Your GP will issue you with a fit note either recommending that you are ‘not fit for work’ or that you ‘may be fit for work taking account of the following advice’, such as a phased return to work, altered hours, amended duties or workplace adaptations.
Any recommendations should only be implemented once they have been discussed and agreed with you.
If your GP has made recommendations which your employer has not implemented, or implemented inadequately, the medical certificate means that you are not fit for work.
After four weeks sickness absence you can also be referred by your GP for a Fit for Work assessment by an occupational health professional who, if you agree, will look at the issues preventing a return to work. The referral will usually lead to a Return to Work Plan. (See our FAQ about returning to work.)
For more information, see the TUC advice on fit notes.