Serum or Plasma Calcium Level (Qualitative or Quantitative Measurement)
This test measures the amount of calcium in your blood, which is important for many body functions, including muscle and nerve function, bone health, and blood clotting.
["Calcium levels help assess bone health, nerve/muscle function, and overall mineral balance in your body."]
Key facts at a glance
- LOINC
- 32869-0
- Short code
- Space 1st+2nd tooth bound Measured
- Synonyms
- Space 1st+2nd tooth bound Measured
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- measured
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your doctor may order this test to check for conditions like low or high calcium levels, which can cause symptoms such as muscle cramps, weakness, or irregular heartbeat. It may also be used to monitor conditions like osteoporosis, kidney disease, or certain hormonal disorders.
What Does the Test Involve?
A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure calcium concentration. The test can be qualitative (yes/no presence) or quantitative (exact amount).
What Are Common Symptoms?
Symptoms of abnormal calcium levels can include muscle spasms, numbness, fatigue, confusion, or irregular heartbeat. However, many people may not show symptoms until calcium levels are significantly out of balance.
What Are Possible Causes?
Low calcium (hypocalcemia) can be caused by vitamin D deficiency, kidney problems, or certain medications. High calcium (hypercalcemia) may result from overactive thyroid, bone diseases, or prolonged exposure to sunlight.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test plays a critical role in diagnosing and managing conditions affecting calcium metabolism. It helps identify whether calcium levels are too low or too high, guiding treatment decisions for conditions like osteoporosis, kidney disease, or metabolic disorders.
Short name
Calcium (Serum/Plasma) – Qualitative/Quantitative
Frequently asked questions
What does a calcium test measure?
How long does it take to get results?
Can I eat or drink before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 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