actually i think 2.6 is for the 1,25 metabolite.
for 25(OH)D3 it's 2.496 according to the site i tend to use,
http://www.unc.edu/~rowlett/units/scale ... _data.html
so 40 works out to the 100 cut-off.
and yes, higher than 40 if you're going for 125-150 nmol/L
the upper cutoff of 250 nmol/L works out to 100 ng/mL
hope that helps, bill!
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com