Glenn-

Hope everything ok. Thank you for your post. I learn something new every day from the sharing of information from this wonderful forum! I too have very low D levels (below 15) without supplementation. Kaiser has routinely given me the 50,000 unit route and finally I have just gone to taking 10,000 to 15,000 units daily to keep my d levels up around 60. Just checked online and found my calcium level at 9.8 . I have not had any of the more specific tests you mentioned. Thanks MrsD for posting the link to the website. Very informative! One question-can hyperparathyroidism have an effect on nerves, specifically causing neuropathy? And from the website I gathered there really were not too many reasons why one has low d levels-first being low diet/no sun (neither in my case-outdoors way too much with horse farm) or hyperparathyroidism. Gives me cause to wonder...................