A urine calcium test measures how much calcium is passed out of the body through urine. The test is also known as the urinary Ca+2 test. Calcium is the most common mineral in the body. It’s used for numerous functions, such as building and repairing bones and teeth. Calcium contributes to the functionality of your nerves, muscles, and heart. It also helps blood to clot. Most calcium is stored in your bones.
http://www.healthline.com/health/calcium-blood-test
What Is an Ionized Calcium Test? Calcium is an important mineral that your body uses in many ways. It increases the strength of your bones and teeth and helps your muscles and nerves function. A serum calcium blood test measures the total calcium in your blood. There are several different forms of calcium in your blood. These include ionized calcium, calcium bound to other minerals called anions, and calcium bound to proteins like albumin. Ionized calcium, also known as free calcium, is the most active form.
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The corrected total serum calcium concentration is normally 8.5-10.2 mg/dL, but there is no sure means of predicting the serum calcium level, for either hypocalcemia or hypercalcemia, at which symptoms will occur. The rapidity of change, as well as the absolute serum calcium concentration, impacts symptom development.
http://emedicine.medscape.com/article/2087447-overview
Calcium concentration, both total and free, is characterized by a high physiological variation, depending on age, sex, physiological state (eg, pregnancy), and even season (owing to the seasonal variation of vitamin D, which is directly involved in the regulation of calcium concentration).
http://emedicine.medscape.com/article/2087447-overview
As 80% of the bound calcium present in the circulation is carried by albumin (albumin has multiple binding sites for calcium), changes in serum albumin concentration trigger significance changes in the concentration of total calcium. Hypoalbuminemia is the most common cause of pseudohypocalcemia.
http://emedicine.medscape.com/article/2087447-overview
The normal adult diet contains about 25 mmol of calcium per day. Only about 5 mmol of this is absorbed into the body per day (see below). Calcium is absorbed across the intestinal epithelial cell's brush border membrane and is immediately bound to calbindin, a vitamin D-dependent calcium-binding protein.
https://en.wikipedia.org/wiki/Calcium_metabolism
The remainder can be found in your blood. When calcium levels in your blood get too low, your bones release enough calcium to bring the level in the blood back to normal. When calcium levels get too high, the surplus of calcium is either stored in bones or expelled from the body through urine or stool.
http://www.healthline.com/health/calcium-blood-test
The amount of total calcium in the blood varies with the level of plasma albumin, the most abundant protein in plasma, and therefore the main carrier of protein-bound calcium in the blood. The biologic effect of calcium is, however, determined by the amount of ionized calcium, rather than the total calcium.
https://en.wikipedia.org/wiki/Calcium_metabolism
An important aspect, or component, of calcium metabolism is plasma calcium homeostasis, which describes the mechanisms whereby the concentration of calcium ions in the blood plasma is kept within very narrow limits.
https://en.wikipedia.org/wiki/Calcium_metabolism
From Wikipedia, the free encyclopedia. Calcium metabolism refers to all the movements (and how they are regulated) of calcium atoms and ions into and out of various body compartments, such as the gut, the blood plasma, the interstitial fluids which bathe the cells in the body, the intracellular fluids, and bone.
https://en.wikipedia.org/wiki/Calcium_metabolism
what is the normal serum calcium'
The normal serum calcium is 8.5 to 10.2 mg/dL