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Labsystems Diagnostics' Neonatal hTSH FEIA Plus is a fluorometric enzyme immunoassay for the quantitative determination of human thyroid stimulating hormone (hTSH, human thyrotropin) in blood samples dried on filter paper as a primary test for screening of babies for congenital hypothyroidism (CH).
hTSH is eluted from dried blood disks. It simultaneously forms a sandwich between the solid phase, coated with an antibody that recognizes a subunit of hTSH and a second antibody derived against another subunit of hTSH, which is labeled with horseradish peroxidase (HRP).