Glossary

1α(OH)D2
1α‑hydroxyvitamin D2. see Doxercalciferol.
1α(OH)D3
1α‑hydroxyvitamin D3. see Alphacalcidiol.
1,25(OH)2D3
1,25‑dihydroxyvitamin D3. see calcitriol.
23,25(OH)2D3
23,25‑hydroxyvitamin D3. Vitamin D metabolite
24,25(OH)D2
24,25‑hydroxyvitamin D2.
24,25(OH)D3
24,25‑hydroxyvitamin D3. Vitamin D metabolite.
24,25(OH)2D2
24,25‑dihydroxyvitamin D2.
24,25(OH)2D3
24,25‑dihydroxycholecalciferol D3. Vitamin D metabolite that is biologically active in cartilage.
25(OH)D or 25(OH)D3
25‑hydroxyvitamin D, or 25‑hydroxycholecalciferol. see calcidiol.
25(OH)D3‑1‑hydroxylase
Enzyme found in the kidneys, where it converts 25(OH)D to 1,25(OH)2D.
24R,25(OH)2D3
24R,25‑dihydroxyvitamin D3. A natural vitamin D metabolite essential for development of normal bone integrity and healing of fractures.
24S,25-(OH)2D3
24S,25‑dihydroxyvitamin D3. Synthetic epimer (mirror image) of 24R,25‑dihydroxyvitamin D3.
19‑Nor‑1,25‑(OH)2D2
19‑nor‑1,25‑dihydroxyvitamin D2. see Paricalcitol.
22‑oxacalcitriol (OCT)
Vitamin D analogue similar to 1,25(OH)2D3, differing only due to an oxygen atom replacing carbon‑22 on the side chain. OCT has demonstrated an ability to suppress PTH synthesis and secretion, both in vitro and in vivo.
25‑hydroxyvitamin D
see calcidiol.
25‑hydroxyvitamin D test
Also known as 25(OH)D test. Test that measures the amount of calcidiol circulating in the blood. The most accurate measure of the amount of vitamin D in the body. see blood calcidiol level.
28‑kilodalton calbindin‑D
Vitamin D‑induced calcium‑binding protein.
7‑dehydrocholesterol
Provitamin D3. A cholesterol precursor whose presence in the skin enables the synthesis of vitamin D3 cholecalciferol from ultraviolet B rays in sunlight.
7‑dehydrositosterol
Sterol which serves as a precursor for sitocalciferol (vitamin D5).