On-call radiology: community standards and current trends.

The issues regarding on-call radiology are complex and contentious. Both academic and private practice radiology centers have encountered increasing workloads in recent years. Some academic centers are utilizing night float systems or other models of call to address the increasing complexity and volume of after-hours cases. Many private practice groups are outsourcing after-hours work to commercial nighthawk radiology services. Emergency medicine department and ACR guidelines place additional expectations on the on-call radiologist.