25-hydroxyvitamin d
2 interactions related to 25-hydroxyvitamin d
prednisone + vitamin d
Glucocorticoids accelerate the catabolism of 25-hydroxyvitamin D, lower active vitamin D metabolites at the gut, and impair calcium absorption. Population data show oral steroid users have more than double the rate of severe vitamin D deficiency compared to non-users.
prednisonevitamin dglucocorticoidosteoporosisbone health25-hydroxyvitamin ddeficiencycorticosteroid
vitamin d + parathyroid hormone test
Vitamin D supplementation does not chemically interfere with the parathyroid hormone (PTH) assay itself, but it physiologically suppresses PTH secretion by raising serum 25-hydroxyvitamin D and calcium levels. A PTH drawn after starting or adjusting vitamin D can therefore look lower than the patient's true baseline, complicating workup of suspected primary hyperparathyroidism or vitamin D deficiency.
vitamin dparathyroid hormonepthhyperparathyroidismcalcium metabolismbone healthlab timing25-hydroxyvitamin d