referral

noun

1. a person whose case has been referred to a specialist or professional group

   noun.person

   Examples

   The patient is a referral from Dr. Bones.

   Source: WordNet 3.0

2. a recommendation to consult the (professional) person or group to whom one has been referred

   noun.communication

   Examples

   The insurance company says that you need a written referral from your physician before seeing a specialist.

   Source: WordNet 3.0

3. the act of referring (as forwarding an applicant for employment or referring a matter to an appropriate agency)

   noun.act

   Source: WordNet 3.0