You probably know by now, but hypoparathyroidism (HP) is rare. It can occur due to low Parathyroid Hormone (PTH), inability to form active PTH and inability of kidneys to respond to PTH. Low PTH usually is a complication of damage to parathyroid gland following thyroid surgery or neck surgery or any damage to gland for any reason. Inability to form active PTH is either acquired or congenital. Acquired form is generally due to an autoimmune disorder in which the body reacts against its own parathyroid cells. Resistance of kidney and bones to PTH is very rare.
“Vitamin D and calcium supplements are the primary treatments for this disease regardless of the cause. The only exception is when the inactivity of PTH is due to hypomagnasemia which is readily treated with magnesium supplementation. At this time, a replacement form of PTH is not available.”
Please refer to this link for further clarification: http://www.endocrineweb.com/hypopara.html
Hope this helps. Please let me know if there is any thing else.
Please... Severe vitamin D deficiency DOES NOT always cause elevation of PTH, thus normal PTH levels with severe vitamin D deficiency doesn't mean you have hypoparathyroidism (unless you have hypocalcemia).
The treatment for severe vitamin D deficiency is INACTIVE vitamin D (cholecalciferol), at high doses (intially 50.000 UI/week during 2-4 weeks and then 25.000 UI/15 days=1.600 UI/day).
Please don't take ACTIVE vitamina D (calcitriol) unless hypoparathyroidism is really and correctly diagnosed.