i Register
In some senses, referral is marked as slang. Watch for register when choosing this word.
ADJ.
initial, primary, private, regular
My doctor gave me a primary referral to a heart specialist last month.
VERB + REFERRAL
get, given, need
My doctor gave me a referral to see a specialist last week.
REFERRAL + NOUN
class, endocrinologist, food, treatment
My doctor gave me a referral to an endocrinologist for my thyroid problems.
PREP.
after, from
After referral from her doctor, she finally got an appointment with the specialist.