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Alternative Names Return to topUrinary Ca+2
Definition Return to top
This test measures the amount of calcium in urine. All cells need calcium in order to work. Calcium helps build strong bones and teeth. It is important for heart function, and helps with muscle contraction, nerve signaling, and blood clotting.
See also: Calcium - blood
How the Test is Performed Return to top
A 24-hour urine sample is generally needed:
A urine collection bag is needed for infants. This is a plastic bag with an adhesive paper on one end. Wash the area around the child's urethra. For boys, place the entire penis in the bag and attach the adhesive to nearby skin. For girls, place the bag over the labia and secure into place with the adhesive. You can place a diaper over the bag.
This procedure may take a couple of attempts -- lively infants can displace the bag. The infant should be checked frequently. Change the bag after the infant has urinated into it. Drain the urine into the container provided by your health care provider and deliver it to the laboratory or doctor's office as soon as possible.
How to Prepare for the Test Return to top
Your doctor may tell you to temporarily stop taking any drugs that may affect the test results.
Drugs that may increase urine calcium measurements include antacids, anticonvulsants, carbonic anhydrase inhibitor diuretics, and loop diuretics.
Drugs that may decrease urine calcium measurements include adrenocorticosteroids, birth control pills, and thiazide diuretics.
NEVER stop taking any medicine without first talking to your doctor.
If the 24-urine collection is being taken from an infant, a couple of extra collection bags may be necessary.
How the Test Will Feel Return to top
The test involves only normal urination, and there is no discomfort.
Why the Test is Performed Return to top
This test is used to diagnose or monitor diseases of the parathyroid gland or kidneys, which can cause a calcium control disorder. If there is not enough calcium in your body fluids, it can lead to hyperexcited nerves and muscles. Too much calcium has the opposite effect.
The most common type of kidney stone contains calcium. This test may be used to diagnose such stones.
Normal Results Return to top
If a person is eating a normal diet, the expected amount of calcium in the urine is 100 to 300 mg/day. If eating a diet low in calcium, the amount of calcium in the urine will be 50 to 150 mg/day.
Note: mg/day = milligrams per day
What Abnormal Results Mean Return to top
High levels of urine calcium may be due to:
Low levels of urine calcium may be due to:
Risks Return to top
There are no risks.
References Return to top
Wysolmerski JJ, Insogna KL. The parathyroid glands, hypercalcemia, and hypocalcemia. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 266.Update Date: 5/7/2009 Updated by: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.