I haven't had my Vitamin D level checked in many years and a recent blood test showed I had low vitamin D so my doctor prescribed 50,000 once a week. I was taking the dose ages for maybe 4-6 weeks . And I went in for further blood tests. At the time my vitamin D level now changed and was good but my PTH level was 79 and my Calcium was 10.7. I was told I most likely have a benign tumor in one of my parathyroids. My question was this: Since you are saying that short term low vitamin D doesn't increase PTH quickly, to me that can also mean the parathyroid may also take longer to correct itself and adjust PTH after normal levels of vitamin D are maintained. Also the time it takes for correction may be related to the length of time the body has been deprived of adequate vitamin D. My doctor tole that I had made an interesting proposal and is now sending me to a endocrinologist. So I would like to know if there is evidence to prove or disprove my supposition?