The National Heart, Lung, and Blood Institute (NHLBI) is seeking small businesses to serve as a study coordinating center for an expansion of the Risk Underlying Rural Areas Longitudinal (RURAL) Heart and Lung Study, focusing on up to four rural counties in the U.S. Southern Plains region. The selected contractor will manage participant recruitment, clinical examinations via mobile units, data and biospecimen repositories, and community engagement to study cardiopulmonary health in underserved rural populations. One award is anticipated around May 2027, with a performance period of four years and four months. The work will be performed in the Southern Plains region of the U.S., with no specific budget amount provided. This is a sources sought notice for market research only, not a solicitation.