Calciumstoneql
A test to detect the presence of calcium in kidney or urinary stones to help determine the cause of stone formation.
{"This test analyzes kidney stones to see if they contain calcium","Calcium stones are the most common type of kidney stones","Results help guide treatment and prevention strategies","The test is performed on a passed or surgically removed stone","High calcium in stones may indicate hypercalciuria or other conditions"}
Key facts at a glance
- LOINC
- 14636-5
- Short code
- CA-STONE
- Synonyms
- Calcium Stone Ql
- Category
- electrolyte
- Sample
- serum
- Container
- Clean, dry specimen container (urine collection container or sterile container for stone)
- Units
- not specified
- Ref low
- 8.5
- Ref high
- 10.5
- Critical range
- 6 not specified – 14 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Qualitative analysis using chemical microscopy, infrared spectroscopy (FTIR), or X-ray diffraction (XRD)
- CPT
- 82345
- SNOMED
- 274367004
- Specimen volume
- One or more calculi/stones (minimum size approximately 1mm recommended for adequate analysis)
- Stability
- Room temperature acceptable; avoid moisture and contamination. Stable for weeks to months when properly stored.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 72–168 hours
- Order
- routine
What is this test?
The Calcium in Stone test is a laboratory analysis that determines whether calcium is present in a kidney stone or urinary stone. When you pass a stone or have one removed, it can be sent to a laboratory for chemical analysis. This test identifies the mineral composition of the stone, specifically looking for calcium compounds such as calcium oxalate or calcium phosphate.
Why is it done?
This test is performed to understand what type of kidney stone you have formed. Knowing the composition helps your doctor determine the underlying cause of stone formation and develop an appropriate treatment plan. Calcium-based stones are the most common type, accounting for about 70-80% of all kidney stones. Understanding that your stone contains calcium can guide dietary recommendations and medication choices to prevent future stones.
How is the sample collected?
The sample is not a blood or urine test. Instead, you need to collect the stone itself. If you pass a stone naturally, strain your urine and save the stone in a clean container. If the stone is removed during a medical procedure, it will be sent directly to the laboratory for analysis. It is important to retrieve the stone if possible, as this test provides valuable information for your treatment.
Reference range
Adult: 8.5-10.5 mg/dLnot specified
No special patient preparation; collect and submit entire dry stone specimen
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Does having a calcium stone mean I have too much calcium in my blood?
What do I do if I pass a stone?
Will I need this test again if I form more stones?
What other tests might be done along with stone analysis?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy