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Serum or plasma concentration of calcium (qualitative or semiquantitative probe screening)

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

This test measures the level of calcium in your blood, which is important for many body functions, including muscle and nerve activity.

Quick summary

["Calcium levels can affect bone health, heart rhythm, and other bodily processes."]

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

Key facts at a glance

LOINC
23286-8
Short code
M myc my sc Ab Ser Ql IB
Synonyms
M myc my sc Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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 healthcare provider 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 might also be used to monitor conditions like kidney disease, bone disorders, or certain medications that affect calcium.

What Does a Result Mean?

Results are not provided as specific numeric ranges here, as the test may be qualitative or semiquantitative. Your provider will interpret the result in the context of your overall health and symptoms. Very low or very high levels may require further testing or treatment.

Common Conditions Monitored

This test is often used to diagnose or monitor conditions such as hypocalcemia (low calcium), hypercalcemia (high calcium), or to check for metabolic bone diseases. It can also be part of routine screening for kidney function or electrolyte imbalances.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for a few hours before the test if it involves a blood draw, but this depends on your provider’s instructions. Bring any medications you’re taking to your appointment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What causes abnormal calcium levels?
Abnormal calcium levels can result from conditions like kidney problems, thyroid disorders, vitamin D deficiency, or certain cancers. Medications, dietary factors, and hormonal imbalances can also play a role. Low calcium may lead to muscle spasms or numbness, while high calcium can cause fatigue or kidney stones.
How often should this test be done?
The frequency depends on your health status. Routine adults may not need calcium tests unless they have risk factors (e.g., kidney disease, osteoporosis). Follow your provider’s recommendations for follow-up testing.
Can diet affect calcium test results?
Yes, dietary calcium intake can influence results. If fasting is required, avoid high-calcium foods (like dairy) for the specified period. Your provider will guide you on any dietary restrictions.
  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