Medical Test Overview: What It Is, How It Is Done, and Why Your Provider May Recommend It as Part of Your Care Plan
This test measures the amount of calcium in fluid samples other than blood, such as urine, cerebrospinal fluid, or pleural fluid.
{"Measures calcium levels in non-blood body fluids","Helps diagnose and monitor conditions affecting calcium metabolism","Results assist healthcare providers in evaluating kidney function, nerve function, and bone disorders","Abnormal results may indicate underlying health conditions requiring treatment","The test is performed using a sample collected from the affected body cavity or fluid"}
Key facts at a glance
- LOINC
- 57919-3
- Short code
- CA
- Synonyms
- Calcium Fld.NB-mCnc
- Category
- electrolyte
- Sample
- serum
- Container
- SST (serum separator tube) or red top tube
- Units
- not specified
- Ref low
- 8.5
- Ref high
- 10.5
- Critical range
- 6 not specified – 13 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- Atomic absorption spectroscopy (AAS) or Colorimetric method using arsenazo III dye binding
- CPT
- 82310
- SNOMED
- 271071006
- Specimen volume
- 1.0-2.0 mL serum minimum
- Stability
- Room temperature: 7 days; Refrigerated (2-8°C): 14 days; Frozen (-20°C): 30 days. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 50
- Lipemia max
- 300
- Icterus max
- 20
- TAT
- 1–4 hours
- Order
- routine
What is this test? This test is a general medical check that collects information about how your body is working and helps guide care.
The Calcium in Nonbiological Fluid test measures the concentration of calcium in various body fluids other than blood, such as urine, cerebrospinal fluid (CSF), pleural fluid, peritoneal fluid, or synovial fluid. Calcium is an essential mineral that plays crucial roles in nerve function, muscle contraction, bone health, and blood clotting.
How is this test performed? A health professional will explain the steps, follow safety measures, and collect information, images, or samples as needed.
A healthcare provider will collect a fluid sample from the appropriate body area using a needle and syringe (a procedure called paracentesis or thoracentesis depending on the fluid location). The sample is then sent to a laboratory where the calcium concentration is measured using specialized equipment.
Why might I need this test? Your provider may order it to check symptoms, monitor a condition, screen for disease, or assess how well treatment is working.
Your doctor may order this test if you have symptoms related to abnormal calcium levels, or to evaluate conditions affecting fluid accumulation in body cavities. It helps diagnose causes of fluid buildup, monitor certain treatments, or assess conditions like kidney stones, neurological disorders, or metabolic imbalances.
Reference range
Not establishednot specified
No patient preparation required (nonbiological fluid specimen)
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal calcium levels in nonblood fluids can indicate various medical conditions. High calcium in urine may suggest hyperparathyroidism, kidney stones, or certain metabolic disorders. Abnormal calcium in cerebrospinal fluid may indicate infections, bleeding, or neurological conditions. Low calcium levels in any fluid may be associated with hypoparathyroidism, vitamin D deficiency, or kidney disease. Results help healthcare providers diagnose the underlying cause of symptoms and guide appropriate treatment.
Frequently asked questions
Is the procedure painful?
How long does it take to get results?
Are there any risks associated with this test?
Do I need to prepare for the test?
Sources
- 1
- 2
- 3LOINC Code ReferenceSource
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 10, 2026. · Read our editorial policy