Search PRO Help
What are "Total Paid Search Referrals"?
"Total Paid Search Referrals" gives you the total monthly paid search referrals during the past month. Each paid referral represents a real user clicking on a real paid search result.
Recommendation: With this metric context is everything, so cross check traffic patterns with the Site Profile tool. The most common cause of change to the paid clickthrough rate is a change in search marketing budget. Before drawing final conclusions you should look at other possibilities.