The research protocol must give a clear indication of what follow up will be provided to the research participants and for how long. This may include a follow u, especially for adverse events, even after data collection for the research study is completed.
The two most important hormones for maintaining calcium levels in the body are parathyroid hormone (PTH) and 1,25(OH)2D (the active form of vitamin D).The major regulator is PTH, which is part of a negative feedback loop to maintain [Ca ++ ] ECF (see Humoral regulation).he two most important hormones for maintaining calcium levels in the body are parathyroid hormone (PTH) and 1,25(OH)2D (the active form of vitamin D).
1 The ratio of calcium stored in the bones and the calcium used by the body is similar. Hence, when the bones are unable to absorb excess calcium, the calcium level increases in the body which may lead to too much calcium in the blood.  Overactive parathyroid gland may lead you to high calcium in the body.