Quick Facts
- Sample: Urine (24-hour collection)
- Fasting: No fasting required
- Turnaround: 1-3 days, may take longer based on weather, holiday, or lab delays
What This Test Measures
This test measures the amount of calcium excreted in your urine over a full 24-hour period. Calcium is an essential mineral involved in maintaining healthy bones and teeth, and it also supports normal function of the heart, muscles, and nerves. Because calcium levels in the body are tightly regulated, the amount excreted through the kidneys can help reflect how the body is handling and eliminating this mineral.
The result reflects a urinary calcium measurement, not a blood calcium level, and the two should not be interpreted the same way. This test does not measure vitamin D, parathyroid hormone, or any other mineral or nutrient. It reflects calcium excretion specifically, over the collection period specified.
Benefits
- Reflects calcium excretion over a full 24-hour period.
- May help evaluate kidney handling of calcium.
- Supports monitoring related to bone, kidney, or parathyroid concerns.
- Provides a urinary measurement distinct from blood calcium testing.
- May be used alongside other clinical information as directed by a provider.
Who Is This Test For?
- Individuals with symptoms associated with abnormal calcium levels.
- People being monitored for bone-related health conditions.
- Individuals with known or suspected kidney-related concerns.
- People with thyroid or parathyroid gland conditions.
- Individuals experiencing symptoms such as bone pain or muscle cramps.
- People whose healthcare provider recommends evaluating urinary calcium.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this test?
This test measures the amount of calcium excreted in your urine over a 24-hour collection period. It may help a healthcare provider evaluate how the kidneys are handling calcium and can be used to help screen for, evaluate, or monitor conditions related to the bones, kidneys, parathyroid glands, and related systems. This is a single urinary measurement and does not, by itself, diagnose a deficiency, excess, or specific disorder.
2. Who would benefit from this test?
This test may be appropriate for individuals experiencing symptoms associated with abnormal urine calcium levels, such as bone pain, muscle cramps, or changes in urination. It may also be useful for those being monitored for bone, kidney, or parathyroid conditions. Whether this test is appropriate depends on individual health history and should be discussed with a healthcare provider.
3. When should I order this test?
You may consider this test if you are experiencing symptoms related to abnormal calcium levels, such as bone pain, muscle weakness, or digestive upset. It may also be used as part of ongoing monitoring for bone, kidney, thyroid, or parathyroid-related conditions. This test does not replace a full medical or nutritional evaluation.
4. How does this test differ from other nutritional tests?
This test measures calcium specifically, using a 24-hour urine collection rather than a blood sample. Urinary calcium reflects how much calcium is being excreted by the kidneys over time, which is different from a blood calcium measurement that reflects circulating levels at a single point in time. These two specimen types provide different information and are not interchangeable. This test does not measure any other mineral, vitamin, or nutrient.
5. Do I need to fast before this test?
No fasting is required for this test. However, medications affecting mineral metabolism should be withdrawn two to four weeks prior to and during collection, if possible. Check with your physician before stopping any medications.
6. How quickly will I get results?
Results are typically available in 1-3 days. This timeframe may take longer based on weather, holidays, or lab delays.
7. How do I interpret the results?
The meaning of your urine calcium result depends on your individual health history, symptoms, medications, and other laboratory findings. A single low or high result does not automatically confirm a deficiency, excess, or specific condition, and a normal result does not necessarily rule out a nutritional or clinical concern. Urinary calcium results should not be interpreted the same way as blood calcium results, since they reflect different aspects of calcium handling. Your provider may consider this result alongside other laboratory findings and your overall clinical picture.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
8. What should I do if my results are abnormal?
If your results fall outside the expected range, review them with a qualified healthcare provider. They can help determine what the result may mean in the context of your health history and whether any additional evaluation or testing should be considered. This test result alone does not provide a complete clinical conclusion.
9. How often should I get tested?
Testing frequency should be determined by your healthcare provider based on your individual health needs and the reason for testing. There is no standard repeat testing schedule associated with this test.
Pre test preparation
Patients must take their lab order to the lab to obtain the proper specimen container before collection. No fasting is required. Medications affecting mineral metabolism should be withdrawn, if possible, two to four weeks prior to and during collection. Check with physician before stopping any medications. Do not stop prescribed medication unless instructed by your healthcare provider.
Urinate at 8am and discard the specimen. Then collect all urine in a 24-hour period, ending with final collection at 8am the next morning. Refrigerate the collected urine between all voidings or keep it in a cool place. Screw the lid on securely. Transport the specimen promptly to the laboratory. The container must be labeled with full name, date and time collection started, and date and time collection finished.
