Vitamine D ni vitamine kandi ni imisemburo ya steroid, cyane cyane irimo VD2 na VD3, imiterere yayo isa cyane. Vitamine D3 na D2 bihindurwamo 25 hydroxyl vitamine D (harimo 25-dihydroxyl vitamine D3 na D2). 25-(OH) VD mu mubiri w'umuntu, imiterere ihamye, ubwinshi bwayo bwinshi. 25-(OH) VD igaragaza ingano yose ya vitamine D, n'ubushobozi bwa vitamine D mu guhindura, bityo 25-(OH)VD ifatwa nk'ikimenyetso cyiza cyo gusuzuma urwego rwa vitamine D. Iyi Diagnostic Kit ishingiye kuri immunochromatography kandi ishobora gutanga igisubizo mu minota 15.