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Causes Heart Disease. | Main | Vitamin D Test Accuracy and
Variation »  Intra-subject variability in Serum 25-D  Dr. Daniel
Riemer has very kindly supplied me with the full text of the
paper by Rejnmark et al I referenced in the last post.  Thank
you Dr. Riemer!  The study is of women who were studied to see
the effects of hormone replacement therapy (estrogen) on a
variety of paramers, including temporal changes in levels of
Vitamin D binding protein and on levels of 25 (OH) D3, which I
will continue to abbreviate as 25-D.  It turns out there were no
significant effects of estrogen replacement on D status. Of
interest to us, they measured 25-D at 0, 1, 2 and 5 years. The
assay used at time zero was different from the one used
subsequently, so analysis of 25-D variability was only assessed
between times 1 and 2 and 2 and 5. The methods section relates
that they drew these levels at the sa