NIH intends to award a firm-fixed-price purchase order to Mayo Collaborative Services Inc. on a sole-source basis for specialized clinical laboratory testing services. Mayo is cited as the only source providing the required integrated combination of specialized testing capabilities, established diagnostic methodologies, expert clinical interpretation, consultation, and coordinated follow-up testing. This notice is not a request for competitive quotations, but responsible sources, including small businesses, may submit a capability statement showing they can meet the minimum technical requirements. Capability statements must include sufficient documentation of an equivalent system, and the government retains discretion not to compete based on responses. Award is anticipated approximately five days after the notice closing if no acceptable capability statements are received.