A member asked:

Hypoparathyroid ca 8.3. low vitamin d now. on calcitriol. 5 mcgs. how is it possible that i am low? and which type of vitamin d inactive or activeform

A doctor has provided 1 answer
Dr. Carol Cheney answered

Specializes in Endocrinology

Depends what taking: There are several stages in producing active vitamin d. The dietary form is converted into 25hydroxyvitamin d which is then converted in the kidney to 1, 25 dihydroxy vitamine d (the "active" form. The usual vitamin d lab test looks for 25 hydroxyvitamin d; Calcitriol is 1, 25 dihydroxyvitamin d. So if you are taking Calcitriol you may have plenty of active vitamin d but a low level of 25 hydroxy.

Answered 6/24/2014

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