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Serum Calcium Level (with Heparin Anticoagulant)

Published: August 9, 2026Updated: August 17, 2026

This test measures the amount of calcium in your blood serum, which is important for maintaining healthy bones, muscles, and nerves. Calcium levels can be influenced by diet, kidney function, and certain medications.

Quick summary

["Your calcium levels help ensure proper bone health and nerve function."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
60475-1
Short code
SRA .2 IU/mL LMW heparin Ser-aCnc
Synonyms
SRA .2 IU/mL LMW heparin Ser-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Might Be Ordered

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, irregular heartbeat, or bone pain. It may also be used to monitor kidney function, thyroid issues, or responses to medications that affect calcium.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the test if it’s part of a broader metabolic panel. Avoid consuming calcium-rich foods or supplements for 24 hours before testing if instructed.

What Happens During the Test

A small blood sample will be drawn from a vein, typically in your arm. The blood is then sent to a lab for analysis. The test is quick and usually painless, though you may feel slight discomfort at the injection site.

What the Results Mean

Results are compared to standard reference ranges, which can vary slightly by lab. Low calcium levels may indicate conditions like hypoparathyroidism or kidney problems, while high levels could suggest hyperparathyroidism or certain medications.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Serum Calcium

Frequently asked questions

What are the normal reference ranges for this test?
Normal reference ranges can vary by lab and may not be provided directly on your report. Your healthcare provider will interpret the results in relation to your overall health and symptoms. If your results fall outside typical ranges, further evaluation may be needed to determine the cause.
How long does it take to get my test results?
Test results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will contact you once results are ready, either through a phone call or secure message.
Can I eat or drink before this test?
If no specific instructions are given, you can usually eat and drink normally before this test. However, if it’s part of a fasting panel, avoid food and liquids (except water) for 8–12 hours beforehand.
  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 17, 2026. · Read our editorial policy