Skip to content

Mass concentration of calcium in serum (total calcium)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of calcium present in your blood serum. Calcium is an essential mineral that helps maintain strong bones, supports nerve and muscle function, and aids in blood clotting.

Quick summary

["Your blood calcium levels help ensure proper bodily functions, including muscle and nerve activity."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
56661-2
Short code
MBP Ser-mCnc
Synonyms
MBP Ser-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Is Done

Your healthcare provider may order this test if you have symptoms like muscle cramps, spasms, or unusual fatigue. It could also be done to check for conditions such as low or high calcium levels, kidney disease, or metabolic disorders like hyperparathyroidism.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into a vein in your arm to draw blood. If you’re anxious, let your healthcare provider know so they can help you relax.

What the Test Results Mean

Results are typically reported as a numerical value, but exact reference ranges can vary by lab. Low calcium levels may indicate conditions like vitamin D deficiency or kidney problems, while high levels might suggest overactive thyroid or certain medications.

Common Conditions Affecting Results

Blood calcium levels can be influenced by diet, medications (like calcium supplements or diuretics), and underlying health issues such as thyroid disorders or chronic kidney disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Calcium (Total)

Frequently asked questions

Why might my calcium levels be checked regularly?
Regular monitoring may be recommended if you have conditions like kidney disease, osteoporosis, or a history of calcium-related disorders. Your provider may also check levels if you’re on long-term medications that affect calcium metabolism.
What does it mean if my calcium levels are too low?
Low calcium can cause muscle spasms, numbness, or irregular heartbeat. It may also lead to long-term health risks like weakened bones. Treatment often involves dietary changes or supplements, depending on the cause.
How can I support healthy calcium levels naturally?
Eat a balanced diet rich in calcium (like dairy products, leafy greens, or fortified foods) and vitamin D (from sunlight or foods like fatty fish). Avoid excessive caffeine or alcohol, which may interfere with calcium absorption.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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