Is there a way to check to see if a link goes to a valid page?

I have code that I only want displayed if the link that is surrounding it is valid.

I am in Wordpress, if that matters. And I thought is_wp_error() might be the way to go, but it's not working.

Hope I'm explaining this well enough. Here's my code:

   $practice_rep_link = "$practice_link-rep/";  
                         if (!is_wp_error($practice_rep_link)) {
                    echo '<h3><a href="'.$practice_rep_link.'"> 

Representative Cases'.''; }