The HUS Group (hereinafter HUS or the Client) requests tenders for cardiolipin antibody assay for the diagnosis of syphilis. The object of the procurement is a test kit based on a flocculation method for the determination of cardiolipin antibodies used in syphilis diagnostics. The test kit will be used for the detection of cardiolipin antibodies in serum and/or cerebrospinal fluid (CSF). The goal of this competitive procurement is to get products that are safe to use and also to have products available when they are needed. The procurement is divided into parts as follows: 1) A flocculation method suitable for serum and cerebrospinal fluid (CSF) (VDRL method) 2) A flocculation method for serum (RPR method) Primarily, the Client will use the products under part 1). For part 1), two suppliers will be selected: a primary supplier and a backup supplier. If both the primary supplier and the backup supplier selected for part 1) are unable to supply the contract products, the Client will use the product selected under part 2). For part 2), one supplier will be selected. The subject matter of the procurement also includes all such supplies, that are related and/or are complementary to the products tendered, such as various package sizes and accessories, which are indicated in "Annex 01 Price and product annex". In addition, during the contract period, products belonging to the product groups that are the subject of the contract, may be acquired in accordance with the estimated value of the contract, also when they are not specified in the product annex (please see Annex 02 Agreement_draft). Contract period is 2 years and after that effective until further notice. Approximately 15,000-20,000 tests are performed per year. This figure is an estimate only, and HUS does not commit to the consumption volumes indicated. The final order quantities may be higher or lower than stated. The analyses are carried out at the Clinical Microbiology unit of the HUS Diagnostic Center in Helsinki. The subject matter and requirements of the procurement are described in detail in the invitation to tender and its annexes.