Estriol (E3)-3-HRP Antigen

A liquid horseradish peroxidase-labeled conjugate from Antibodies.com, the Estriol (E3)-3-HRP Antigen supports competitive immunoassay workflows targeting the steroid estrogen estriol. In this preparation, HRP is attached at the 3-position of the estriol molecule, allowing the conjugate to compete with free estriol in samples for binding to capture antibodies. This makes it a critical reagent for researchers developing or running quantitative estriol assays, particularly those supporting maternal-fetal health studies and prenatal screening research. Estriol, the predominant estrogen produced by the placenta during pregnancy, is commonly measured in the second and third trimesters as part of fetal well-being and aneuploidy screening panels. Supplied as a 1 ml liquid aliquot of antigen-HRP conjugate, the reagent works with ELISA and related enzyme-based detection platforms. Researchers can use this conjugate to establish standard curves, optimize antibody pairings, or adapt protocols for high-throughput screening of clinical samples.