The most important regulator of serum 1,25 (OH)2 vitamin D concentration is:
Correct Answer: Parathyroid hormone
Description: A major function of parathyroid hormone is to act as a trophic hormone to regulate the rate of formation of 1,25(OH)2 vitamin D. The mechanism by which parathyroid hormone exerts this effect may be secondary to its effects on phosphorus metabolism. Other hormones, including prolactin and estrogen, also may playa role in stimulating the production of 1,25(OH)2 vitamin D.
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