Laboratory Response Network (LRN)

The LRN is the nation's laboratory emergency response system for biological, chemical and radiological threats and other public emergencies such as natural disasters.

A location routing number (LRN) is an identification for a telephone switch for the purpose of routing telephone calls through the public switched telephone network (PSTN) in the United States.

Sentinel laboratories play a key role in the early detection of biological agents. Sentinel laboratories provide routine diagnostic services, rule-out, and referral steps in the identification process. These laboratories can evaluate whether samples should be sent to an LRN reference laboratory for further testing.