The National Heart, Lung, and Blood Institute (NHLBI) intends to award a sole source contract to Advarra, Inc. for continued Institutional Review Board (IRB) services supporting ongoing multi-site clinical research studies. The services are required to ensure regulatory compliance and maintain oversight continuity for active studies under IDE and IND protocols. This notice is not a request for competitive proposals. Interested parties may submit a capability statement demonstrating their ability to meet the requirement.