Ko te Huaora D he huaora, he homoni pūtaiaki hoki, ko te nuinga ko te VD2 me te VD3, he tino rite te hanganga. Ka hurihia te Huaora D3 me te D2 ki te 25 hydroxyl vitamin D (tae atu ki te 25-dihydroxyl vitamin D3 me D2). 25-(OH) VD i roto i te tinana tangata, struction pūmau, kukū tiketike. Ko te 25-(OH) VD e whakaatu ana i te tapeke o te huaora D , me te kaha hurihanga o te huaora D, na ko te 25-(OH)VD ka whakaarohia ko te tohu pai rawa atu mo te aromatawai i te taumata o te huaora D. Ko te Kete Tohunga i runga i te immunochromatography ka taea te whakaputa hua i roto i te 15 meneti.