Efficient or clever way to determine if there is a next page while paginating

I am getting 50 rows for each page from the database.

when the returned rows are less than 50 it is clear that there is no next page. but when the results are 50 rows, how can I determine if there is a next page efficiently.

As a last result I probably would do a "select count(*)" on the initial call but i am wondering if there is another way to save me this call to the database