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Osteocalcin (Bone Gla-Protein) in Serum/Plasma

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

This test measures osteocalcin, a protein produced by bone cells that helps regulate bone formation. It can help assess bone health and activity.

Quick summary

["Osteocalcin helps track bone turnover and may indicate bone health or conditions like osteoporosis."]

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

Key facts at a glance

LOINC
35964-6
Short code
XR tomo Elbow-Bl
Synonyms
XR tomo Elbow-Bl
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

What Is Osteocalcin Used For?

Osteocalcin is primarily used to evaluate bone metabolism and diagnose or monitor conditions affecting bone density or formation. It can also assist in assessing treatment responses for bone-related disorders.

How Is This Test Performed?

A blood sample is drawn from a vein, usually in your arm. The blood is then processed to separate serum or plasma for testing. The test measures the concentration of osteocalcin using an immunoassay method.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you have symptoms of bone disease, such as pain, fractures, or abnormal bone density. It may also be used in monitoring conditions like osteoporosis, Paget’s disease, or metabolic bone disorders.

What Do Results Mean?

Results can vary depending on individual health, age, and medical conditions. Elevated levels may suggest increased bone formation, while lower levels might indicate reduced bone turnover or metabolic bone disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Bone Marker

Frequently asked questions

What causes abnormal osteocalcin levels?
Abnormal levels can result from conditions like osteoporosis (lower levels), hyperparathyroidism (higher levels), or certain cancers affecting bone metabolism. Hormonal imbalances, vitamin D deficiency, or medications may also influence results.
How soon will I get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss them with you during your follow-up visit.
Can I fast before this test?
No fasting is required for this blood test. However, always follow your healthcare provider’s instructions for any specific preparations.
  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