Ko te Huaora D he huaora, he homoni steroid ano 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 o te hurihanga o te huaora D, na ko te 25-(OH)VD ka kiia ko te tohu pai rawa atu mo te arotake i te taumata o te huaora D. Ko te Kete Tohu Whakaata kei runga immunochromatography a ka puta he hua i roto i te 15 meneti.