Test library
Urine Calcium Test
A Calcium urine test measures the amount of calcium excreted in urine over a collection period. It is used to evaluate kidney stone risk, parathyroid function, and conditions that disturb calcium balance.
Order Calcium, Urine Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Calcium, Urine Test- Typical turnaround
- 1-3 business days
- Starting price
- From $29
- Results
- Confidential, online
Quick answer
A Calcium urine test measures how much calcium leaves the body in urine. Because the kidneys help regulate calcium, the amount excreted can offer clues about parathyroid activity, bone turnover, and the risk of forming kidney stones. The test usually involves a timed collection, and results are interpreted together with blood calcium and other tests.
What this test measures
Calcium balance depends on the interplay between the bones, kidneys, parathyroid glands, and vitamin D. The kidneys filter calcium and reabsorb much of it, and the amount that appears in urine reflects how much the body is excreting. A urine calcium measurement can reveal patterns that a blood test alone would not show, particularly when the concern involves stone formation or hormone regulation.
The test is usually performed on a timed urine collection, such as a twenty-four-hour sample, although some orders use a shorter collection. The laboratory measures the total calcium in the sample and may also report related values such as urine creatinine to confirm that the collection was complete. Correct collection timing is important for an accurate result.
Clinicians order a urine calcium test to investigate recurrent kidney stones, to evaluate suspected parathyroid disorders, or to monitor conditions and treatments that affect calcium handling. It may also be used when blood calcium is abnormal and the cause is unclear. The result is interpreted with blood calcium, parathyroid hormone, and vitamin D levels.
- Urine calcium (timed collection)
- Urine creatinine (collection adequacy)
- Urine calcium-to-creatinine ratio
- Serum calcium when paired
- Parathyroid hormone (PTH) when paired
- Vitamin D (25-hydroxy) when paired
- Urine oxalate when stone evaluation is ordered
- Urine citrate when stone evaluation is ordered
Why people order this test
- Evaluate recurrent kidney stones
- Investigate suspected parathyroid disorders
- Monitor calcium handling in kidney disease
- Clarify an abnormal blood calcium result
- Follow conditions or treatments that affect calcium
- Assess calcium loss with a provider
How to prepare
A timed urine collection is usually required, and the laboratory provides containers and exact start and stop instructions. Some orders call for a specific diet during collection, so follow the guidance supplied with the kit. Blood may also be drawn at the same time.
Understanding your results
Results are typically available within one to three business days after the collection is complete. The report shows the amount of calcium excreted and may include related values. High or low excretion can point to several conditions, and a qualified healthcare provider interprets the result with other findings.
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Frequently Asked Questions
How is the sample collected?
Most orders use a timed urine collection, often over twenty-four hours. The laboratory provides a container and specific start and stop instructions.
Why is creatinine measured in the urine sample?
Urine creatinine helps confirm that the collection was complete and can be used to calculate a ratio that adjusts for sample concentration.
What does high urine calcium mean?
High urine calcium can be linked to parathyroid activity, diet, medications, or other conditions. It is one factor in evaluating kidney stone risk and is interpreted with other tests.
Do I need to change my diet during collection?
Some orders ask for a specific diet so results are easier to compare. Follow the instructions provided with the collection kit.
Is the urine calcium test the same as a blood calcium test?
No. They measure calcium in different compartments. Blood calcium shows the circulating level, while urine calcium shows how much the kidneys are excreting.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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