Multiple choice A person's vitamin D status can be determined by measuring the serum concentration of Calcidiol and Cholecalciferol Calcitriol and Ergocalciferol Calcidiol and 25-hydroxyergocalciferol Calcitriol and 25-hydroxyergocalciferol Reveal answer Fill a bubble to check yourself C Correct answer Explanation A person's vitamin D status is determined by measuring the serum concentration of Calcidiol and 25-hydroxyergocalciferol.