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Serum Calcium Concentration (Mass Concentration)

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

This test measures the amount of calcium in your blood serum, which is important for maintaining healthy bones, muscles, nerves, and other body functions.

Quick summary

["Your blood calcium levels help ensure strong bones and proper nerve/muscle function."]

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

Key facts at a glance

LOINC
26154-5
Short code
XR Scapula-Bl Views
Synonyms
XR Scapula-Bl Views
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
xr
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?

Doctors may order a serum calcium test to check for conditions like low or high calcium levels, which can cause symptoms such as muscle cramps, weakness, or abnormal heart rhythms. It’s also used to monitor certain treatments or medical conditions that affect calcium balance, such as kidney disease or thyroid disorders.

What Does the Test Involve?

You’ll have a small needle inserted into a vein (usually in your arm) to draw blood. The blood sample is then sent to a lab for analysis. The test typically takes a few minutes, and you may feel slight discomfort, but it’s usually over quickly.

What Are Common Causes of Abnormal Results?

Low calcium levels (hypocalcemia) may be caused by conditions like vitamin D deficiency, kidney problems, or certain medications. High calcium levels (hypercalcemia) can result from overactive thyroid, bone diseases, or prolonged exposure to sunlight.

What Do My Results Mean?

Your results will be compared to standard reference ranges provided by your healthcare provider. While exact values can vary by lab, abnormal results may trigger further testing or adjustments to treatment plans.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Serum Calcium

Frequently asked questions

Why might my doctor ask for repeated calcium tests?
If you have an ongoing medical condition like kidney disease, thyroid issues, or osteoporosis, or if you’re taking medications that affect calcium levels, your doctor may recommend regular calcium tests to monitor your levels and adjust treatment as needed.
How long does it take to get my calcium test results back?
Results are typically available within 1–3 business days, depending on your lab and healthcare provider’s processing times. Your doctor will discuss the results with you during your follow-up visit.
Can I eat or drink anything before my calcium test?
You can eat and drink normally before the test, as it doesn’t require fasting. However, always follow your doctor’s specific instructions for your appointment.
  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