Post-mortem - When it is done 

A post-mortem is usually carried out within two to three days after a death. This is because the earlier the examination is held, the more likely it is to provide useful information.

If you require the funeral of a partner or relative to take place within 24 hours due to religious reasons, you should inform the hospital or the coroner's office. The pathologist will try to do the post-mortem within the time limit.