Osteocalcin
Osteocalcin measures bone formation activity and turnover, helping evaluate bone metabolism and monitor osteoporosis treatment effectiveness.
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What this test measures
Osteocalcin is a protein hormone produced by osteoblasts (bone-building cells) and is widely accepted as a marker of bone formation activity. The most important noncollagen protein in bone matrix, osteocalcin accounts for approximately 1% of the total protein in human bone. Its production is dependent upon vitamin K and is stimulated by vitamin D, containing specialized amino acid residues that help it bind calcium.
Measuring serum osteocalcin helps evaluate the rate at which new bone is being formed and reflects the rate of bone formation activity. When osteocalcin is incorporated into the bone matrix, it is also released into the circulation during bone breakdown, making it a marker of overall bone turnover rather than just bone formation. The protein is also known as bone gamma-carboxyglutamic acid-containing protein (BGLAP) and is secreted during the bone formation phase of bone remodeling.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Postmenopausal individuals who may be at increased risk for bone loss, as estrogen decline typically accelerates bone turnover and osteocalcin levels can help assess bone metabolism changes.
- Those with a family history of osteoporosis or fractures who want to evaluate their bone formation activity before clinical symptoms develop.
- Individuals currently receiving treatment for osteoporosis or other bone conditions who need to monitor the effectiveness of their therapy, including bisphosphonates or hormone replacement therapy.
- Patients with conditions that may affect bone metabolism, such as hyperparathyroidism, kidney disease, or hyperthyroidism, where osteocalcin levels can help assess bone turnover.
- People taking medications that may impact bone health, including long-term steroid use or certain cancer treatments, who want to monitor bone formation activity over time.
- Adults with unexplained frequent fractures or bone pain who may benefit from evaluation of their bone metabolism and turnover rates.
What to expect
Preparation
Fasting for 12 hours is required before the test. Avoid taking multivitamins or supplements containing biotin (vitamin B7) for 12 hours before blood collection, as these may interfere with test results.
Sample Type
A healthcare professional will draw blood from a vein in the arm using a small needle. The blood draw typically takes less than 10 minutes and involves minimal discomfort.
Collection
The blood sample is collected in a special tube and must be processed properly to ensure accurate results. The serum is separated and may need to be frozen for transport to the laboratory.
Turnaround
Results are typically available within 3-5 business days after the laboratory receives the sample.
Understanding your results
Osteocalcin levels are usually reported in ng/mL (nanograms per milliliter), with normal ranges typically around 8-32 ng/mL. Levels can vary between laboratories due to differences in equipment and methods, and some labs provide different ranges for men and pre- and post-menopausal women.
| Population | Reference Range | Notes |
|---|---|---|
| Adult Men | 9-42 ng/mL | Based on N-MID osteocalcin assay methodology |
| Premenopausal Women | 9-42 ng/mL | Levels may vary with menstrual cycle phase |
| Postmenopausal Women | 15-42 ng/mL | Often slightly elevated compared to premenopausal women due to increased bone turnover |
Reference ranges may vary by laboratory and individual factors. Results should be interpreted by a healthcare provider in the context of your overall health.
What does a “Low” result mean?
Decreased osteocalcin levels may be observed in conditions such as hypoparathyroidism, hypothyroidism, and growth hormone deficiency. Low levels can also result from certain medications, including glucocorticoids and antiresorptive agents such as bisphosphonates or hormone replacement therapy. Lower osteocalcin levels typically indicate reduced bone formation activity, which may suggest slower bone metabolism or the effects of bone-protective treatments.
What does a “High” result mean?
Increased levels of osteocalcin are typically found in bone diseases characterized by increased bone turnover, including osteoporosis, osteomalacia, rickets, hyperparathyroidism, renal osteodystrophy, and thyrotoxicosis. Elevated osteocalcin may also be associated with Paget disease of the bone, cancer accompanied by bone metastases, and individuals with healing fractures. High levels generally indicate that bone formation and breakdown processes are occurring at an accelerated rate, which may require further evaluation to determine the underlying cause.
Privacy & confidentiality
Your osteocalcin test results are completely confidential and protected under HIPAA regulations. Results are not shared with insurance companies, employers, or added to your permanent medical record without your consent. No doctor visit required to order this test.
Frequently asked questions
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This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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