Understanding Your Laboratory Test
This test measures the amount of calcium in the cerebrospinal fluid (CSF), the clear liquid that surrounds the brain and spinal cord.
{"A CSF calcium test checks calcium levels in the fluid around your brain and spine","It helps doctors diagnose conditions affecting the central nervous system","The test is performed using a sample of cerebrospinal fluid collected via lumbar puncture","Abnormal calcium levels may indicate various neurological or metabolic disorders","Results are interpreted alongside other CSF findings and clinical symptoms"}
Key facts at a glance
- LOINC
- 1997-6
- Short code
- CSF Calcium
- Synonyms
- Calcium CSF-sCnc
- Category
- electrolyte
- Sample
- csf
- Container
- Sterile CSF collection tube (plain, no anticoagulant) or sterile collection container
- Units
- not specified
- Ref low
- 1
- Ref high
- 1.4
- Critical range
- 6 not specified – 14 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Spectrophotometry (Arsenazo III method) or Ion-Selective Electrode (ISE)
- CPT
- 82310
- SNOMED
- 271434006
- Specimen volume
- 0.5-1.0 mL minimum, preferably 1-2 mL
- Stability
- Analyze within 2 hours if at room temperature; if delayed, refrigerate at 2-8°C for up to 24 hours. Avoid repeated freezing/thawing.
- Hemolysis max
- 200
- TAT
- 2–24 hours
- Order
- routine
This test is a medical examination that measures specific substances in your body to help your doctor evaluate your health. It can be a blood test, urine test, or other type of sample analysis. The results provide important information about how well your organs are functioning and can help detect medical conditions early.
The CSF Calcium test measures the concentration of calcium in your cerebrospinal fluid. Cerebrospinal fluid is a clear, protective liquid that surrounds your brain and spinal cord. Calcium is an important mineral that helps maintain proper nerve function, muscle contraction, and bone health. This test helps doctors evaluate whether your calcium levels in the central nervous system are within normal range.
Your doctor may order this test to help diagnose a medical condition, to monitor the effectiveness of an ongoing treatment, or to screen for potential health issues even before symptoms appear. It is often used as part of a routine checkup to get a baseline of your health status and to identify any abnormalities that may require further investigation.
Your doctor may order a CSF calcium test to help diagnose or monitor conditions affecting the brain and spinal cord. It is often part of a broader cerebrospinal fluid analysis (lumbar puncture panel) that examines multiple substances in the fluid. The test can help identify infections, inflammatory conditions, bleeding, or metabolic disorders that may affect the central nervous system.
The sample for this test is usually collected by a healthcare professional. For a blood test, a small needle is used to draw blood from a vein in your arm. For urine tests, you will be asked to provide a clean catch sample in a sterile cup. Depending on the test, other samples like saliva or tissue may be collected. The procedure is quick and generally causes minimal discomfort.
The sample is collected through a procedure called lumbar puncture (spinal tap). During this procedure, a healthcare provider inserts a thin needle into the lower back to withdraw a small amount of cerebrospinal fluid. The area is first numbed with a local anesthetic to minimize discomfort. The collected fluid is then sent to a laboratory for analysis.
Reference range
1.0-1.4 mmol/Lnot specified
No special preparation; specimen obtained by lumbar puncture
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal CSF calcium levels can provide important diagnostic information. Low CSF calcium (hypocalcemia) may be associated with conditions such as hypoparathyroidism, vitamin D deficiency, malnutrition, or certain kidney disorders. Elevated CSF calcium (hypercalcemia) may indicate conditions like hyperparathyroidism, cancer, sarcoidosis, or certain infections. However, CSF calcium results must be interpreted in context with other CSF parameters and the patient's overall clinical presentation.
Frequently asked questions
Is the lumbar puncture procedure painful?
How long does it take to get results?
Do I need to fast before this test?
What do abnormal results mean?
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