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C Terminal Telopeptide (CTX) – Bone Resorption Marker

C terminal telopeptide (CTX) is a blood marker for bone resorption. It is used in the diagnosis of osteoporosis and for monitoring bone-related therapies.

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Things worth knowing about "C Terminal Telopeptide"

C terminal telopeptide (CTX) is a blood marker for bone resorption. It is used in the diagnosis of osteoporosis and for monitoring bone-related therapies.

What Is the C Terminal Telopeptide?

The C terminal telopeptide (also known as CTX or beta-CTX) is a biochemical marker released during the breakdown of bone tissue. It is a small protein fragment produced when type I collagen – the main structural protein of bone – is degraded. CTX enters the bloodstream and can be measured in blood serum. Elevated levels indicate increased bone resorption activity in the body.

Medical Significance and Clinical Use

The C terminal telopeptide is primarily used in osteoporosis diagnostics and in monitoring therapies that affect bone turnover. Key clinical applications include:

Diagnosis and monitoring of osteoporosis
Monitoring of antiresorptive therapy (e.g., bisphosphonates or denosumab)
Risk assessment for jaw osteonecrosis before dental procedures in patients on bisphosphonate therapy
Assessment of bone status in conditions such as Paget's disease of bone, bone metastases, or multiple myeloma
Monitoring during hormone replacement therapy or other bone-active treatments

How Is the Test Performed?

The CTX level is measured from a blood sample, ideally taken in the morning after fasting overnight. This standardization is important because CTX levels fluctuate significantly throughout the day and are influenced by food intake. The measurement uses an immunological method such as an ELISA or electrochemiluminescence immunoassay. Results are reported in picograms per milliliter (pg/ml).

Reference Values and Interpretation

Normal CTX values depend on age and sex:

Premenopausal women: generally below 573 pg/ml
Postmenopausal women: values up to approximately 1008 pg/ml may still fall within the reference range
Men (ages 30–50): generally below 584 pg/ml

Elevated CTX values indicate increased bone resorption, which can occur in osteoporosis, bone metastases, Paget's disease, or following menopause. Very low values may suggest excessive suppression of bone turnover, for example during long-term bisphosphonate therapy.

Relevance in Dentistry

In dental medicine, the CTX value plays a specific role. For patients receiving bisphosphonate treatment, CTX levels are often measured before invasive dental procedures. A very low value (below 100 pg/ml) is considered an indicator of increased risk for medication-related osteonecrosis of the jaw (MRONJ). However, the predictive value of this test remains scientifically debated and should always be interpreted within the broader clinical context.

Factors Influencing CTX Levels

Several factors can affect measured CTX levels:

Time of blood collection (morning fasting sample is the standard)
Food intake (temporarily lowers CTX levels)
Physical activity
Medications such as corticosteroids, bisphosphonates, or hormonal preparations
Kidney function (CTX may be elevated in renal insufficiency)
Pregnancy and breastfeeding

References

Eastell R et al. - Diagnosis of Endocrine Disease: Bone turnover markers: are they clinically useful? European Journal of Endocrinology, 2018.
Dachverband Osteologie (DVO) - S3 Guideline on Prophylaxis, Diagnosis and Treatment of Osteoporosis, 2023.
Ruggiero SL et al. - American Association of Oral and Maxillofacial Surgeons Position Paper on Medication-Related Osteonecrosis of the Jaw. Journal of Oral and Maxillofacial Surgery, 2022.

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