25-hydroxyvitamin d
2 interactions related to 25-hydroxyvitamin d
prednisone + vitamin d
Glucocorticoids such as prednisone speed up the breakdown of vitamin D and blunt vitamin D-driven calcium absorption at the gut, which contributes to bone loss. Population data link oral steroid use to a higher rate of severe vitamin D deficiency, so vitamin D plus adequate calcium is a standard part of long-term steroid care.
prednisonevitamin dglucocorticoidosteoporosisbone health25-hydroxyvitamin ddeficiencycorticosteroid
vitamin d + parathyroid hormone test
Vitamin D supplementation genuinely lowers parathyroid hormone (PTH) by raising serum calcium and active vitamin D, so a PTH test drawn after recent vitamin D can read below the patient's true untreated baseline. This is a real physiologic effect and a timing/interpretation issue, not an assay artifact or a dangerous interaction.
vitamin dparathyroid hormonepthhyperparathyroidismcalcium metabolismbone healthlab timing25-hydroxyvitamin d