Skip to content

Serum or plasma mass concentration of calcium

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

This test measures the amount of calcium in your blood, which is important for many body functions, including muscle and nerve activity, as well as bone health.

Quick summary

["Calcium levels help doctors check for conditions like low or high calcium, which can affect your bones, heart, and other organs."]

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

Key facts at a glance

LOINC
36061-0
Short code
MR Scapula
Synonyms
MR Scapula
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
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 spasms, bone pain, or unusual fatigue. It might also be checked during routine exams, especially if you have conditions like kidney disease, thyroid issues, or osteoporosis.

What to Expect Before the Test

You can eat and drink normally before this test. If you’re taking calcium supplements or certain medications, let your doctor know. For blood tests, you’ll typically have a small needle inserted into your arm, and you may feel a brief pinch.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for testing. The process usually takes a few minutes.

What Are Possible Results?

Results will show the amount of calcium in your blood, measured in milligrams per deciliter (mg/dL). Your doctor will compare these results to your health and symptoms to determine if further action is needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Abnormally low calcium levels (hypocalcemia) can cause muscle cramps, seizures, or irregular heart rhythms. High calcium levels (hypercalcemia) may lead to fatigue, kidney stones, or confusion. Both conditions can be serious and require medical attention. Your doctor will interpret results in the context of your overall health.

Short name

Calcium Level

Frequently asked questions

What does a low or high calcium level mean?
A low calcium level may indicate conditions like vitamin D deficiency, kidney problems, or certain cancers. A high level could suggest overactive thyroid, bone diseases, or prolonged use of certain medications. Your doctor will discuss these findings with you.
How often should I get this test?
Your doctor will decide how often you need this test based on your health history, symptoms, and other tests. Some people may need it yearly, while others may need it less often or only when symptoms appear.
Can I eat or drink anything before the test?
Yes, you can eat and drink normally before this test unless your doctor advises otherwise. Avoiding certain foods or drinks for a specific time may not be necessary for calcium tests.
  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