The N antigen, first reported in 1927, is a part of the MNS antigen system, which is a human blood group system based upon 2 genes, glycophorin A and glycophorin B. There are currently 46 antigens in this system but the most important are M, N, S, s and U. The N antigen generally reacts at room temperature and so is usually irrelevant in Haemolytic Blood Transfusion Reactions and Haemolytic Disease of New-born. This Anti-N reagent is for the in vitro detection and identification of the human N blood group antigen by direct agglutination.

The Biorex Diagnostics Anti-N Lectin blood grouping reagent is prepared from an extract of Vicia unijugaleaves, diluted with a sodium chloride solution containing bovine albumin. This reagent is supplied ready for use and does not require any further dilution or addition.