Urine
24h Urine Calcium
CONVERT & COMPARE
mg/24h
=
3.12
mmol/24h
Reference ranges by source
Published adult intervals: 5, from 3 named sources, shown in mg/24h.
SOURCE
SEX
AGE
RANGE
VISUAL
CITE
About 24h Urine Calcium
A calcium in urine test measures the amount of calcium in your urine (pee). If your urine calcium levels aren't normal, it may be a sign of kidney disease, a parathyroid disorder, bone disease, or another condition that affects how your body uses calcium.
Calcium is one of the most important minerals in your body. Most of your calcium is stored in your bones and teeth. About 1% of the calcium in your body is in your blood. If there's too much calcium in your blood, the extra calcium may be stored in your bones or passed in your urine and stool (poop).
Having just the right amount of calcium in your blood is necessary for your nerves, muscles, and heart to work properly. Calcium also helps your blood clot when needed, supports enzyme function, and is involved in bone metabolism. Your blood calcium levels are carefully controlled by your parathyroid glands, which are 4 pea-sized glands in your neck. If your blood calcium levels get too low, these glands make parathyroid hormones (PTH). The hormones are chemical messengers in your bloodstream that work to increase your blood calcium levels until they are normal again. Vitamin D, calcitonin, adrenal hormones, and other factors also help keep blood calcium in the right range.
Main source: MedlinePlus ↗
Useful for
Diagnose kidney stones if you have symptoms. Most kidney stones are made of calcium, so a calcium in urine test helps your health care provider figure out if a kidney stone could be causing your symptoms and whether it's likely made of calcium.
Estimate your risk of forming calcium-based kidney stones (such as calcium oxalate or calcium phosphate stones), since extra calcium in urine is a major contributor to stone disease.
Diagnose or monitor problems with how well your kidneys are working.
Learn more about how your parathyroid glands are working if you have symptoms of underactive parathyroid glands or have been diagnosed with overactive parathyroid glands.
Look into causes of bone disease, including osteoporosis and osteomalacia, where calcium loss in the urine can play a role.
Track how well treatments such as thiazide-type water pills are working at lowering urine calcium in people who form recurring calcium stones.
Learn more about the cause of abnormal results on a calcium blood test.
Main source: MedlinePlus ↗
Interpretation
Higher than normal calcium levels in urine may be a sign of many conditions, including: a kidney stone; overactive parathyroid glands (hyperparathyroidism); certain types of cancer, including cancer that spreads to the bones; bone disorders, including Paget's disease of bone and osteoporosis; sarcoidosis; vitamin D excess; or long periods of being unable to move around.
In adults, the risk of forming kidney stones tends to go up when 24-hour urine calcium is above roughly 250 mg in men and 200 mg in women, although your provider will look at the full picture of your urine results, not just one number.
Lower than normal calcium levels in urine may be a sign of many conditions, including: kidney disease; underactive parathyroid glands (hypoparathyroidism); too little vitamin D or magnesium; malabsorption disorder; and malnutrition.
If your calcium levels aren't normal, it doesn't always mean you have a medical condition that needs treatment. Urine calcium levels can be affected by your diet, certain supplements (such as taking too much vitamin D for a long period of time), and certain medicines, including antacids and some diuretics (water pills).
If you have questions about your results, talk with your provider.
For general wellness information only. Talk to a clinician about your specific results.
Main source: MedlinePlus ↗
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Related biomarkers
More tests in the urine category.
Sources
Last updated 2026-05-02
This page presents source-specific reference data and sourced explanations. For general wellness information only. This is not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.