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Serum or Plasma Calcium Concentration (Electrolyte Panel)

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

This test measures the amount of calcium in your blood or plasma, which is important for muscle function, nerve signaling, and bone health.

Quick summary

["Check your calcium levels to help prevent complications like weak bones or abnormal heart rhythms."]

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

Key facts at a glance

LOINC
38768-8
Short code
XR tomo Femur-R
Synonyms
XR tomo Femur-R
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-tomography
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 if you have symptoms like muscle cramps, bone pain, or unusual fatigue. It’s also part of routine checks for kidney disease, heart conditions, or metabolic disorders.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the blood draw if it’s part of a broader panel. Wear loose clothing for easy access.

What Happens During the Test?

A healthcare provider will insert a small needle into your arm to draw blood. You may feel a slight pinch, but it usually takes only a few minutes. The sample is then sent to a lab for analysis.

What Are Possible Results?

Results are compared to standard ranges, but exact values depend on the lab. Low calcium (hypocalcemia) or high calcium (hypercalcemia) may indicate underlying health issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormal calcium levels can signal conditions like kidney disease, thyroid disorders, or bone diseases. Low calcium may cause muscle spasms or seizures, while high levels could lead to kidney stones or heart problems. Regular monitoring helps manage these risks.

Short name

Calcium Level

Frequently asked questions

What causes low calcium levels?
Low calcium can result from dietary deficiencies, kidney problems, or conditions like vitamin D deficiency or chronic kidney disease. Rarely, it may be linked to certain medications or autoimmune disorders.
What causes high calcium levels?
High calcium is often due to overactive thyroid, kidney issues, or prolonged exposure to certain medications. Bone diseases like osteoporosis or cancer (especially from bone metastasis) can also raise levels.
How often should I get this test?
Your doctor will determine frequency based on your health status. Routine checks may occur every 1–3 years for adults without symptoms, but more often if you have risk factors.
  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