The instruments of Renaissance music Musical instruments have been in use for millennia, but their place in the music of the Middle Ages and Renaissance was often sharply defined and restricted. In the view of the MediÃ¦val church, the human voice was an instrument created by God, and thus more able to sing His glories than instruments created by people.
Low total calcium (hypocalcemia). The most common cause of low total calcium is: 1  Low blood protein levels, especially a low level of albumin, which can result from liver disease or malnutrition, both of which may result from alcoholism or other illnesses.2  Low albumin is also very common in people who are acutely ill. urine calcium test may be ordered when someone has symptoms of kidney stones, such as a sharp pain in the person's side or back around the kidneys, pain that may progress to lower in the abdomen, and/or blood in the urine.
The hormone also stimulates kidney production of the active form of vitamin D, which triggers increased calcium absorption from the gut. Low levels of PTH -- due to autoimmune disease or another cause -- can lead to abnormally low blood calcium.itamin D. Vitamin D acts as a hormone in your body to help regulate blood calcium. This steroid hormone is so vital in maintaining calcium balance that its active form is sometimes referred to as calcitriol.