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Serum or plasma concentration of calcium (qualitative probe)

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.

Quick summary

["Calcium levels help ensure your body stays balanced and healthy."]

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

Key facts at a glance

LOINC
23258-7
Short code
M cap capric Ab Ser Ql CF
Synonyms
M cap capric Ab Ser Ql CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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, fatigue, or irregular heartbeat. It might also be used to monitor certain treatments or medical conditions, such as kidney disease or bone disorders.

What Does the Test Involve?

A blood sample is taken from a vein, usually in your arm. The sample is then analyzed to determine the calcium concentration. The results help your healthcare provider assess your overall health and guide treatment decisions.

What Are Common Causes of Abnormal Results?

Calcium levels can be affected by diet, kidney function, hormone imbalances (like parathyroid hormone), certain medications, or underlying health conditions such as hypoparathyroidism or hyperparathyroidism.

What Are the Possible Symptoms?

Symptoms of low calcium (hypocalcemia) may include muscle spasms, numbness, or tingling in the hands and feet. Symptoms of high calcium (hypercalcemia) can include fatigue, frequent urination, or kidney stones.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What does a qualitative probe test mean?
A qualitative probe test provides a general indication (yes/no or present/absent) rather than a precise measurement of calcium levels. This type of test is often used for screening or initial assessment rather than detailed monitoring.
Will I need to prepare for this test?
No special preparation is usually needed. However, inform your healthcare provider about any medications you are taking, especially those that affect calcium levels, such as certain diuretics or vitamin D supplements.
Results can typically be available within a few hours to a couple of days, depending on your healthcare facility. Follow-up with your provider to discuss the results and any next steps.
Yes, if your results are outside the expected range, your healthcare provider may recommend further testing or additional blood work to determine the cause and guide treatment.
  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