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Lab Test

NTxN-Tellopeptide (Collagen Crosslinked) - Urine 24H Test

The NTxN-Tellopeptide (Collagen Crosslinked) - Urine 24H test, often referred to as the NTx test, is a crucial diagnostic tool used by healthcare professionals to monitor bone turnover in patients. This test measures the levels of N-terminal telopeptide, a type of molecule released during bone resorption, in a 24-hour urine sample.


Bone is a living tissue that is continuously being broken down and replaced. The process of bone breakdown is known as resorption, and the rebuilding of bone is called formation. These processes are usually balanced, resulting in a constant bone mass in healthy adults. However, if resorption occurs more quickly than formation, it can lead to conditions such as osteoporosis, a disease characterized by weak and brittle bones.

  • Profile Name: NTxN-Tellopeptide (Collagen Crosslinked) - Urine 24H Test
  • Sample Type: Urine
  • Preparations Required: Avoid taking multivitamins or dietary supplements that contain biotin (vitamin B7) that can affect the result. No other specific preparation is required before the test.
  • Report Time: 4 days

The NTx test is especially important for monitoring the efficacy of osteoporosis treatment. If the treatment is working, the NTx level should decrease, indicating a reduction in bone resorption. Conversely, an increase in NTx level could suggest an elevated bone turnover rate, indicating that the treatment may not be effective, or the disease is progressing.

Home Sample Collection Process

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Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
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Reporting of the sample at lab
Reporting of the sample at lab
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Frequently Asked Questions

The NTx test is an important tool for diagnosing and monitoring bone diseases, such as osteoporosis. It provides information about the rate of bone resorption, which is crucial for assessing the risk of fractures and the effectiveness of osteoporosis treatment.

No, fasting is not required for the NTx test. However, you should avoid taking multivitamins or dietary supplements that contain biotin (vitamin B7) before the test, as they can affect the results.

The NTx test measures the levels of N-terminal telopeptide in the urine, which are released during bone resorption. High levels of NTx can indicate a high rate of bone turnover, which may suggest an increased risk of fractures, the progression of osteoporosis, or the inefficacy of treatment.

The frequency of the NTx test depends on the individual's health status and the healthcare provider's assessment. For individuals with osteoporosis or at a high risk of developing it, regular testing may be recommended to monitor bone turnover and treatment efficacy.

Normal values for the NTx test can vary depending on the lab and the individual's age and sex. However, generally, lower NTx values are desirable as they indicate a lower rate of bone turnover.

Apart from avoiding biotin (vitamin B7) before the test, no other specific precautions are needed. However, it's important to inform your healthcare provider of any medications or supplements you're currently taking, as some can affect the test results.

If your NTx levels are higher than normal, it's recommended to consult with a rheumatologist or endocrinologist. They specialize in diseases related to bones and hormones, respectively, and can provide suitable treatment and management strategies based on your individual health situation.

Various factors can affect NTx levels, including age, sex, dietary habits, physical activity, alcohol consumption, smoking, and certain medications. Hormonal changes, particularly in women during menopause, can also affect NTx levels.

High levels of NTx in the urine indicate a high rate of bone resorption, which can lead to reduced bone density and increased fracture risk. On the other hand, low NTx levels suggest a low rate of bone turnover, which is generally associated with better bone health.

The 24-hour urine collection for the NTx test allows for the assessment of bone resorption over an entire day. This is useful as it provides a more accurate representation of bone turnover rate as opposed to a single snapshot in time.

Calcium supplements do not directly affect NTx levels. However, they can influence bone health by supplying the necessary minerals for bone formation. If you are taking calcium supplements for osteoporosis, an NTx test can help monitor the effectiveness of your treatment regimen.

Yes, other health conditions such as hyperthyroidism, hyperparathyroidism, and renal disease, among others, can affect NTx levels. Certain types of cancers that have spread to the bones can also increase NTx levels.

Yes, adopting a healthy lifestyle can positively impact your NTx levels and overall bone health. Regular weight-bearing exercise, a diet rich in calcium and vitamin D, limiting alcohol intake, and quitting smoking are all beneficial for bone health.

Certain medications, such as glucocorticoids, anticonvulsants, and aromatase inhibitors, can increase bone resorption and thereby increase NTx levels. On the other hand, medications used to treat osteoporosis, such as bisphosphonates, can decrease bone resorption and thereby lower NTx levels.

This could indicate that your current treatment regimen is not effectively controlling your bone resorption. However, individual responses to medication can vary. Your healthcare provider may consider adjusting your treatment plan or exploring other potential causes of increased bone resorption.

Persistently high NTx levels may indicate ongoing high bone turnover, which could lead to a reduction in bone density and an increased risk of fractures. It's crucial to consult with your healthcare provider to determine the cause and develop a suitable treatment plan.

Yes, although women are at a higher risk, particularly after menopause, men can also develop osteoporosis. Regular monitoring of bone health is important for both sexes, especially as they age.

Understanding the NTx test is crucial to maintaining good bone health. This test provides a measure of bone resorption, and it is an invaluable tool for diagnosing and monitoring conditions such as osteoporosis. By taking proactive steps, such as adopting a healthy lifestyle and getting regular check-ups, you can help ensure that your bones stay strong and healthy for as long as possible.

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