Hi there Best ,
I do very much agree with you about testing , that is the best way of diagnosing , in conjunction with an experienced medical professional assessing your personal symptoms. We have to be so careful about so called "normal" results , which actually can be anything but ....
From the Vit D point of view , a " normal " result in the typical range found in the UK, is actually very much below optimum , in a great many cases, probably the majority. As I have tried to point out on numerous posts here in Mumsnet.
In answer to your post, I am aware of hyperparathyroidism ( excess parathyroid hormone). But one problem is , it is not on the horizon of most professionals looking at a person presenting with various symptoms which may suggest it. You are right , that PHPT is much more common than traditionally thought. ( especially in post menopausal women).
Some research in Minnesota, has shown, in their population, they could expect up to about 0.8% of post-menopausal women to be either clinically or sub-clinically affected. In the general population it is about 1/3 of that level.
So yes, in an ideal world , testing for vitamin D , and calcium , would be an ideal thing to do. If you have any bone type problems then you should be able to make a good argument for the doctor to test both.
If anyone suspects that they are hypercalcaemic, ( have a look at the symptoms I posted on the previous page), then IF you can get a calcium blood test , then of course, it is a really good idea. I would hope, that if any of us have been diagnosed to be vitamin D deficient, by an NHS consultant , they would have checked calcium levels , before prescribing Vit D. If calcium was found to be normal , then most likely you do not have PHPT, since a raised level of calcium would normally be a consequence of PHPT.
Secondary hyperparathyroidism is a consequence, in some cases, of Vitamin D deficiency. In this case a reduced level of calcium in the blood , causes the parathyroid hormone to rise, causing a higher percentage of calcium in our food to be extracted but also, crucially, in some cases, instructing the body to release calcium from the bones, thus normalising blood calcium. See one of my earlier posts for details. This response can result in osteoporosis, osteomalacia, bone pain etc etc.
Just to clarify, raised parathyroid hormone ( normal – but at the higher end of normal ) can be a symptom of low vitamin D. This mechanism , i.e. your body’s compensation for deficiency of Vit D , is an excellent way to estimate, at a population level or in an individual where sufficiency is. It turns out that when blood levels of vitamin D rise to about 80 nmol/l then parathyroid hormone levels drops to the lower end of normal, thus indicating that around 80nmol/l of vit D is the required optimum for calcium homeostasis. ( assuming you do not have PHPT). That is just one of the reasons many medical bodies worldwide recognise that a level of 50 is just not sufficient. ( Unfortunately, up to now, in the UK, that fact has not yet been fully accepted. )
Here I am talking about just calcium homeostasis (i.e. regulation of internal conditions), other bodily systems require even higher levels of vitamin d to work at optimal efficiency. For instance, lactation. ( see my earlier posts ).
You will see that vitamin D researchers recommend 100 – 150 as optimal. Modern humans , when exposed to a natural ( i.e. ancient ) environment have levels of 120 -140 , as do all other primates in their natural environment. We should all have those levels, for optimal health.
One thing that should be mentioned is that , 50% and more of our population have insufficient Vitamin D , and they should not avoid correcting that situation , by fear of a health problem which admittedly does affect a certain number of people, but , most likely not them.
Crikey …. I hope anyone reading through this thread does not get bored by all this. It is however very important. It seems to be more like a book, than a thread on a forum .
Hope this is helpful
BTBH