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VIDAS® NEPHROCHECK® is an automated test for use on the VIDAS® 3 instrument for the immunoenzymatic quantitative determination of TIMP-2 (Tissue Inhibitor of Metalloproteinase-2) and IGFBP-7 (Insulin-like Growth Factor-Binding Protein 7) proteins in human urine using the ELFA technique (Enzyme Linked Fluorescent Assay) for calculation of the AKIRISKTM Score. The VIDAS® NEPHROCHECK® assay is intended to be used in conjunction with clinical evaluation in patients who currently have or have had within the past 24 hours acute cardiovascular and or respiratory compromise and are ICU patients as an aid in the risk assessment for moderate or severe acute kidney injury (AKI) within 12 hours of patient assessment. The VIDAS® NEPHROCHECK® test is intended to be used in patients 21 years of age or older.

Each VIDAS® NEPHROCHECK® kit contains: x60 NEPH Reagent Strips, x60 NEPH Solid Phase Receptacles (SPR), 1 NEPH control and 1 NEPH calibrator. The VIDAS® NEPHROCHECK® principle combines an enzyme immunoassay competition method with a final fluorescent detection (ELFA). The Solid Phase Receptacle (SPR®) serves as the solid phase as well as the pipetting device for the assay. The interior of the NEPH SPR is coated with mouse monoclonal lgG anti-IGFBP-7 andanti-TIMP-2. The Reagent Strips consist of 10 wells covered with a labeled foil seal. Well 1 is designated for the sample. Six of the wells contain conjugate, wash buffers and substrate. Last well contains the fluorescence substrate. All of the assay steps are performed automatically by the instrument. Two detection steps, one for each protein, are performed successively in Well 10. · The first step is a classical detection step with measurement of the substrate background and incubation of the substrate in the bottom of the SPR®, to generate the first fluorescent signal, which is specific for the IGFBP-7 protein. · Before the second detection step, the antibodies and proteins in the bottom of the SPR® are removed using the cleaning solution contained in Well 5. The previously used substrate in Well 10 is removed and replaced by fresh substrate contained in Well 9. A new substrate background is then measured, and the substrate is incubated in the top of the SPR® to generate the second fluorescent signal, which is specific for the TIMP-2 protein. For each protein, the intensity of the fluorescence is proportional to its concentration in the sample. At the end of the test, the protein concentrations are calculated by the instrument in relation to the two calibration curves, one corresponding to each protein, and encoded in the MLE data. The instrument calculates the AKIRISK™ Score, which is defined as the product of the concentrations of the two proteins, expressed in ng/mL, divided by 1000: AKIRISK™ Score = ([TIMP-2] x [IGFBP-7]) / 1000 The result of the VIDAS® NEPHROCHECK® assay is reported as the AKIRISK™ Score.