... two purplish red streaks appear on the test lines. The color intensity of the test lines increase in proportion to ... the NT-proBNP concentration.Then insert test card into the FIA8000 Quantitative Immunoassay Analyzer, the ... Endocrinology, Oncology, Nephrology, Surgical Department, the community medical institution, on-site emergency treatment, etc. One step test for NT-proBNP