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Bone Protein (Collagen Type I) Crosslinked C-Telopeptide

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

This test measures a specific protein fragment released when bone breaks down, helping assess bone health and detect conditions like osteoporosis.

Quick summary

["A marker of bone turnover that may signal bone loss or healing over time."]

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

Key facts at a glance

LOINC
69076-8
Short code
RF Bone PC Bx
Synonyms
RF Bone PC Bx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rf
CPT
86430
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 Matters for Bone Health

Bone breakdown is a natural process, but certain conditions can speed it up. This test helps track how much bone is being broken down, which can be important for diagnosing or monitoring conditions like osteoporosis or other bone diseases.

What to Expect During the Test

A small blood sample is taken from your arm, similar to other blood tests. The sample is sent to a lab for analysis. No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if instructed by your healthcare provider.

Common Uses and Conditions Monitored

Doctors may order this test to evaluate bone health before treatments like hormone therapy, monitor osteoporosis progression, or check for conditions affecting bone metabolism. It can also help assess recovery after bone-related injuries.

What the Results Mean

Higher-than-normal levels may indicate increased bone breakdown, which can be seen in osteoporosis, cancer treatments, or other bone diseases. Lower levels might suggest slower bone turnover, though this isn’t always clinically significant without clinical context.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test provides a snapshot of bone resorption activity but isn’t a standalone diagnosis. Results are interpreted alongside other factors like medical history, symptoms, and imaging studies to guide treatment decisions.

Short name

CTX (Bone Resorption Marker)

Frequently asked questions

What causes elevated CTX levels?
Elevated CTX levels are often linked to conditions that increase bone breakdown, such as osteoporosis, certain cancers (like multiple myeloma), or treatments that weaken bones (e.g., steroids). Other factors, like aging or hormonal imbalances, may also play a role.
How often should I get this test?
Your doctor will determine the frequency based on your health needs. For example, people with osteoporosis may get it every 6–12 months to monitor progress, while others may need it less often or only as needed.
Can diet or exercise affect CTX levels?
Dietary factors like calcium, vitamin D, and protein intake may influence bone health indirectly, but they don’t directly affect CTX levels. Exercise, particularly weight-bearing activities, can support bone strength and may slow bone breakdown over time.
  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