Spot urine calcium and calcium-creatinine ratio
Quick answer: This test measures calcium in a single urine sample and often compares it with creatinine to allow for how concentrated the urine is. Doctors use it to look into kidney stones and calcium problems, especially when a 24-hour collection is hard.
- SampleUrine
- TakesA few minutes to give the sample
- Before the testNo special preparation is usually needed.
How the test is done
- 1You get a clean container from the lab
- 2You pass a midstream urine sample, often the second morning urine
- 3You close and label the container
- 4The lab measures calcium and creatinine to work out a ratio
What your results can mean
Reading your report
Normal ranges differ between labs and by age and sex, so discuss your result with your doctor.
If the result is outside the usual range
A high ratio can be seen with conditions that cause the kidneys to lose extra calcium, raising the chance of kidney stones. A low ratio can be seen with low vitamin D, low calcium intake or some inherited conditions.
Who usually has this test
People with kidney stones or calcium problems, children, and people who cannot easily do a 24-hour collection.
Risks and aftercare
Giving a single urine sample involves no discomfort or risk.
Names and options
Also called: urine calcium creatinine ratio, UCa/Cr
Options
- Spot urine calcium
- Calcium-creatinine ratio
Listed by the hospital as
- CALCIUM SPOT URINE
- CALCIUM CREATININE RATIO, URINE
Questions about this test
Why is calcium compared with creatinine?
Creatinine is passed at a fairly steady rate. Comparing calcium with it allows for how dilute or concentrated your urine is.
Is a spot test as good as a 24-hour collection?
A 24-hour test gives a fuller picture, but a spot ratio is a useful and easier option, especially in children.
Does the time of day matter?
Yes. Calcium in urine changes after meals, so the lab may ask for a sample at a certain time, such as the second morning urine.
Related tests
Tamara Hospital & IVF Centre, Rajajinagar
34/3, 10th Cross Road, opp. Vardhaka Sardar Patel School, 1st N Block, 2nd Stage, Rajajinagar, Bengaluru 560010
The hospital is open 24 hours. Call before you come to check the timing for your scan or sample collection.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.