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Osteocalcin (Bone-Specific Alkaline Phosphatase Activity)

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

This test measures the activity of alkaline phosphatase specifically linked to bone formation, helping assess bone health and turnover.

Quick summary

["A key marker for bone metabolism and healing."]

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

Key facts at a glance

LOINC
35959-6
Short code
XR tomo Clavicle
Synonyms
XR tomo Clavicle
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 formation activity. It can help diagnose conditions affecting bone metabolism, such as osteoporosis, Paget’s disease, or healing fractures. It may also be checked in patients with suspected metabolic bone diseases or those undergoing treatment for bone-related disorders.

How Is This Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then processed to measure alkaline phosphatase activity associated with bone tissue.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like bone pain, fractures, or conditions like hypercalcemia, hyperparathyroidism, or metabolic bone diseases. It may also be used during monitoring of treatments for bone disorders.

What Do Results Mean?

Results are not typically provided in absolute units alone but are often interpreted in relation to clinical context, such as symptoms, other lab tests, and medical history. Elevated levels may suggest increased bone formation, while lower levels could indicate reduced bone activity.

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 osteocalcin levels can result from conditions affecting bone metabolism, such as fractures, Paget’s disease, or certain cancers. Medications, hormonal imbalances, or liver/kidney disorders may also influence results. Always discuss findings with your healthcare provider.
How often should I get this test?
The frequency depends on your medical condition and treatment plan. Your doctor will determine if regular monitoring is needed, such as for monitoring bone health during treatment or managing chronic conditions.
Can lifestyle changes affect osteocalcin levels?
Yes, lifestyle factors like diet (calcium, vitamin D), exercise, and smoking can influence bone health and potentially osteocalcin levels. Maintaining a balanced diet, staying physically active, and avoiding smoking may support bone health.
  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