How do I create a generic service test that checks if a Windows service is running?

I'm setting up generic service tests and aggregate services to check the health of my applications in my company. I've been successful with using the "custom script" option to run commands on my Linux servers such as "/etc/init.d/whatever status". However, I can't figure out a way to monitor the status of the Windows services on a Windows server.

Is anyone here monitoring their services with a generic service test? If so, how are you doing it?