Go to manage sites in analytics, select a site profile and click on the link for check status.
AFAIK, this refers to the old Google Analytics interface and no longer works in the new one.
One way to do what you want:
Sign in to Google Analytics.
Click on "All Accounts" (top left), this will take you to "Account Home"
Click the "Admin" button (top right), this will take you to "Account Administration"
Select the appropriate account
Select the account again.
You should now see your profile and several tabs
Select the tab "Tracking Code"
Look for the section titled "Website Tracking"
There you will see a point entitled "Tracking Status"
If all is good, this should say "Receiving Data"
I'm sure there's a less complicated way to do this, but this worked for me.