The National Institutes of Health intends to award a non-competitive, firm-fixed-price purchase order to Becton Dickinson for preventative maintenance of three BD LSRFortessa Flow Cytometers. The required services will be performed at the NIH/NIAID facility in Bethesda, MD. The base period of performance is from May 25, 2026, to May 24, 2027, with one optional year through May 24, 2028. These instruments are critical for ongoing clinical research involving over 5,000 patients, and any service delay could compromise sample validity and research. This opportunity is not set aside for small businesses under NAICS code 811210.