This document provides guidance on writing effective referral letters. It outlines the key components that should be included in a referral letter such as patient demographic information, history of present illness, past medical history, medications, physical exam findings, investigations, clinical impressions, and expectations for the referral. Referral letters are the primary means of communication between physicians when a patient is being referred to a specialist or other provider. A clear, concise referral letter helps ensure continuity of care and avoids issues like delayed diagnosis, unnecessary testing, or patient dissatisfaction. The document emphasizes that referral letters require practice to write effectively and provides examples of content that should be included.