Doctor's note, perhaps (8)

I believe the answer is:

referral

(Other definitions for referral that I've seen before include "Recommendation to consult a professional" , "Handover to specialist" , "Act of passing on (for consultation, etc)" , "Being passed on to a specialist" , "Act of consulting with or handing over to another" .)

I've seen this clue in The New York Times.

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