Calcium - Urine
Alternate Names : Urinary Ca+2
Definition
This test measures the amount of calcium in urine. All cells require calcium for numerous functions. Calcium is especially important in the structure of bones and in neuromuscular activity.
A deficiency of calcium in the body fluids causes hyperexcitable nerves and muscles. Excess calcium has the opposite effect. Calcium is also an important component of kidney stones. Urinary calcium levels may therefore help identify causes of kidney stone formation.
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Why is the Test Performed?
Calcium is usually measured to screen for or monitor diseases of the bone or calcium regulation disorders (that is, diseases of the parathyroid gland or kidneys). Urinary calcium levels aid the clinician in understanding how the kidneys handle calcium in certain disease states involving calcium balance including diseases of the parathyroid gland. Urinary calcium levels are also essential in the medical evaluation of kidney stones.
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