Calciumsnvscnc
This test measures the amount of calcium in the fluid surrounding your joints.
{"Synovial fluid lubricates joints and helps them move smoothly","Calcium levels in joint fluid can indicate joint health problems","The test uses a small sample of fluid extracted from the joint","Abnormal results may suggest inflammation, infection, or joint damage","The procedure is typically performed by a rheumatologist or orthopedist"}
Key facts at a glance
- LOINC
- 14418-8
- Short code
- CA-SF
- Synonyms
- Calcium Snv-sCnc
- Category
- electrolyte
- Sample
- fluid
- Container
- Sterile leak-proof container (plain red top tube or sterile universal container), preferably without anticoagulant; if multiple tests are ordered, consider lithium heparin tube
- Units
- not specified
- Ref low
- 2.1
- Ref high
- 2.6
- Critical range
- 6 not specified – 14 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- Spectrophotometry using Arsenazo III dye binding or Ion-Selective Electrode (ISE)
- CPT
- 82150 (Calcium, body fluid)
- SNOMED
- 272501003
- Specimen volume
- 1-2 mL minimum, 3-5 mL preferred for comprehensive analysis
- Stability
- Room temperature: 24 hours; Refrigerated (2-8°C): 72 hours; Frozen (-20°C): 1 week. Avoid repeated freeze-thaw cycles.
- Hemolysis max
- 300
- TAT
- 4–24 hours
- Order
- routine
What is this test?
The Synovial Fluid Calcium test measures the concentration of calcium in the synovial fluid—the viscous liquid that cushions and lubricates your joints. Synovial fluid helps reduce friction between bones during movement. Calcium is an important electrolyte in the body, and its levels in joint fluid can provide valuable information about joint health.
Why is this test performed?
This test is usually ordered when a patient experiences unexplained joint pain, swelling, or stiffness. It helps doctors diagnose conditions affecting the joints, such as arthritis, gout, pseudogout, joint infections (septic arthritis), or inflammatory disorders. The test may also be used to monitor the effectiveness of treatment for joint conditions.
How is the test performed?
A healthcare provider will first clean the skin over the affected joint with an antiseptic. Then, they will insert a thin needle into the joint space to withdraw a small amount of synovial fluid (a procedure called arthrocentesis). This sample is sent to a laboratory for analysis. The procedure may cause brief discomfort or pressure. Local anesthetic is often used to minimize pain.
How to prepare for the test?
No special preparation is usually required. Inform your doctor about any medications you are taking, especially blood thinners, as they may increase the risk of bleeding. Tell your doctor if you have any bleeding disorders or allergies to anesthetics. Wear comfortable, loose-fitting clothing that allows easy access to the joint being tested.
Are there any risks?
The risks are minimal but may include bleeding, infection, bruising, or swelling at the puncture site. There is also a small risk of damage to the joint or surrounding tissues. These risks are rare when the procedure is performed by an experienced healthcare professional.
Reference range
2.1-2.6 mmol/L (approximates serum; not well-established)not specified
No special preparation required; specimen obtained by arthrocentesis
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
How long does the test take?
Does the test hurt?
What do abnormal results mean?
Can I resume normal activities after the test?
How is synovial fluid analysis different from blood calcium testing?
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