One question we're asked on a regular basis about interventional radiology equipment is, "What's the difference between a cath lab and an electrophysiology (EP) lab?" It’s a great question and, from a cursory look at the cath lab system being used, you wouldn’t notice a difference. Both cardiac catheterization and electrophysiology labs use the same, small-detector radiology system hardware- a GE Innova 2100 IQ or Philips Allura FD10, for instance. Still, there are significant differences between these two lab setups that require more than a brief glance to understand. We'll discuss these below.