The Department of Health and Human Services, specifically the National Institutes of Health (NIH), is issuing a presolicitation notice for the procurement of Simple Plex Cartridge Kits for the ELLA Instrument. The NIH intends to award a firm fixed price Purchase Order on a sole source basis to Cyvek Inc., the sole provider of these kits, which are essential for studying protein biomarkers in various biological samples. The Simple Plex Cartridge Kits are critical for ensuring accurate testing results and maintaining the integrity of ongoing research, as they are the only compatible products for the ELLA Instrument. Interested parties capable of providing similar products may submit a capability statement by July 20, 2025, to Tasha Lowe at lowet2@mail.nih.gov.