Table 1.
Vitamin D terminology
| Vitamin D2 and metabolites | Vitamin D3 and metabolites | Collective terminology | |
|---|---|---|---|
|
Prohormone (native vitamin) | |||
| Abbreviation | D2 | D3 | D |
| Full term | Vitamin D2 | Vitamin D3 | Vitamin D |
| Synonym | Ergocalciferol | Cholecalciferol | |
|
Prehormone (product of 1st hydroxylation) | |||
| Abbreviation | 25(OH)D2 | 25(OH)D3 | 25(OH)D |
| Full term | 25-Hydroxyvitamin D2 | 25-Hydroxyvitamin D3 | 25-Hydroxyvitamin D |
| Synonym | Ercalcidiol | Calcidiol | |
|
Hormone (product of 2nd hydroxylation) | |||
| Abbreviation | 1,25(OH)2D3 | 1,25(OH)2D3 | 1,25(OH)2D |
| Full term | 1,25-Dihydroxyvitamin D2 | 1,25-Dihydroxyvitamin D3 | 1,25-Dihydroxyvitamin D |
| Synonym | Ercalcitriol | Calcitriol | |