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Tag: test

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By Dr. Alex Jimenez DC, APRN, FNP-BC, CFMP, IFMCP 0 Comments Chiropractic Care, Therapy , , , , , , , , , , , , , , , , ,

Understanding Nerve Conduction Velocity in Health Care

Should individuals experiencing nerve pain or various sensations get a nerve conduction velocity study to examine nerve health and function?

Nerve Conduction Velocity

A nerve conduction velocity (NCV) is a noninvasive test that measures the speed and strength of nerve stimulation using electrical probes placed on the skin. It’s used to diagnose nerve damage or disease, often alongside an EMG (electromyogram) to differentiate between nerve and muscle problems. It can also evaluate sensory issues, pain, and weakness of the extremities.

  • This test involves safe electrical shocks that can be slightly uncomfortable but not painful.
  • Nerve conduction velocity (NCV) measures the speed at which electrical impulses travel along a nerve fiber, which measures how quickly electrical signals travel through a nerve.
  • This information indicates nerve health and function.
  • Electromyography (EMG) is a nerve test that involves placing tiny needles into the muscles.
  • A slower NCV can indicate nerve injury or dysfunction.

Test Uses

Generally, the test is ordered to assess peripheral nerve diseases, those that connect from the muscles, organs, and skin to the spinal cord or brain. It can help identify the type and location of nerve damage.

  • Peripheral nerve conditions typically cause pain, sensory loss, tingling, or burning.
  • Mild weakness and diminished reflexes can be detected during a neurological examination.

Conditions

Nerve conduction studies are performed to help diagnose conditions.

  • Herniated disc disease
  • Sciatic nerve problems
  • Carpal tunnel syndrome
  • Guillain-Barré syndrome
  • Nerve damage (neuropathy), such as from diabetes, chemotherapy, or autoimmune disorders
  • Charcot-Marie-Tooth disease

Nerve compression

  • Many different conditions, including trauma, inflammation, and tumors, can compress one or more nerves.

Radiculopathy

  • Often described as a pinched nerve, radiculopathy can affect an arm or a leg, causing pain and weakness.

Peripheral Neuropathy

  • This nerve damage begins in the most distal nerves, those farthest from the center of the body, such as the toes and fingers. It is often due to chronic alcohol misuse, uncontrolled diabetes, nutritional deficits, and inflammatory diseases. (Ferdousi M. et al., 2020)

Carpal Tunnel Syndrome

  • Commonly caused by inflammatory diseases or overuse of the wrists, such as from assembly line work, carpal tunnel syndrome causes numbness, pain, and weakness of the fingers and hands. (Tada K. et al., 2022)

Ulnar neuropathy

  • This common condition causes arm pain and sensory changes, usually due to repetitive movements or a prolonged position that causes pressure on the ulnar nerve.

Guillain-Barré syndrome (GBS)

  • This inflammatory condition causes demyelination, or loss of the insulating covering around nerves, which results in leg weakness.
  • It begins in the motor nerves, which send signals to muscles in the legs. (Shibuya K. et al., 2022)
  • The inflammation travels to nerves of the upper body, often affecting the muscles that control breathing.
  • Respiratory support is necessary until the condition improves.

Chronic Demyelinating Polyneuropathy (CIDP)

  • This condition is a chronic, recurrent form of GBS that usually affects the legs and causes episodes of weakness.

ICU neuropathy

  • Metabolic changes, severe illness, and not moving enough can cause nerves to develop a pattern of weakness and sensory loss.

Myasthenia gravis (MG)

  • This autoimmune condition affects the junction between the nerves and the muscles.
  • Myasthenia gravis causes drooping eyelids and weakness of the arms and shoulders.

Amyotrophic lateral sclerosis (ALS)

  • ALS is a serious, degenerative disease affecting the spinal cord’s motor neurons.
  • Amyotrophic lateral sclerosis progresses rapidly, resulting in substantial weakness of muscles throughout the body.

How it’s Done

  • Surface electrodes are placed on the skin over nerves, and a small electrical current is applied to stimulate the nerve.
  • The time it takes for the electrical signal to travel between the electrodes is measured, and this time is used to calculate the NCV.

Values

Normal NCV values are generally between 50 and 70 meters per second. However, these values can vary depending on the nerve and the individual.

NCV Factors

Various factors can influence NCV.

  • Age
  • Sex
  • Medical conditions like diabetes

Interpretation

  • A slower NCV can indicate nerve damage or demyelination (loss of the myelin sheath, which insulates nerve fibers), while an EMG can help determine if the problem is with the nerve or the muscle.

Results

The results of NCV testing can be used to determine the type, severity, and location of nerve damage. The results will be ready in report form about a week after the test.

  • The test measures velocity (how fast a nerve transmits signals) and amplitude (how many nerve fibers were activated). (Tavee J. 2019)
  • The measurements are transmitted to a computer and shown as waves and numerical values.
  • The values are compared to a standard measurement based on the tested nerve.
  • The distance between the electrodes.
  • The person’s age.

Compared to the standard, the NCV results can identify certain patterns of nerve damage. (Tada K. et al., 2022) Outcomes include: (Tavee J. 2019)

  • If one or more nerves are affected.
  • If motor nerves (control movement), sensory nerves (transmit sensory signals), or both are affected.
  • Whether a nerve is blocked or damaged.
  • The severity of the damage.
  • The type of nerve damage
  • Axonal (damage to the nerve itself)
  • Demyelination (damage to the protective fatty layer around the nerve)

The results can help point to certain diagnoses.

Preparation Before the Test

Individuals will not need to change their diet before having an NCV. However, patients will be asked to avoid lotions or creams on their skin before the test. Individuals who are also having an EMG at the time of their NCV might be asked to stop taking medications or supplements that increase the risk of bleeding and bruising. If a healthcare provider says not to stop taking the medicines for health reasons, the patient might be warned that they could have some bruising after the EMG test.

  • NCV may advise against getting the test for those with electrical device implants.
  • Make sure your healthcare providers are aware of your whole medical history.

Injury Medical Chiropractic & Functional Medicine Clinic

Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to develop an optimal health and wellness solution. We focus on what works for you to relieve pain, restore function, and prevent injury. Regarding musculoskeletal pain, specialists like chiropractors, acupuncturists, and massage therapists can help mitigate the pain through spinal adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal issues.

Peripheral Neuropathy and Chiropractic Care

References

Ferdousi, M., Kalteniece, A., Azmi, S., Petropoulos, I. N., Worthington, A., D’Onofrio, L., Dhage, S., Ponirakis, G., Alam, U., Marshall, A., Faber, C. G., Lauria, G., Soran, H., & Malik, R. A. (2020). Corneal confocal microscopy compared with quantitative sensory testing and nerve conduction for diagnosing and stratifying the severity of diabetic peripheral neuropathy. BMJ open diabetes research & care, 8(2), e001801. https://doi.org/10.1136/bmjdrc-2020-001801

Tada, K., Murai, A., Nakamura, Y., Nakade, Y., & Tsuchiya, H. (2022). In Carpal Tunnel Syndrome, Sensory Nerve Conduction Velocities Are Worst in the Middle Finger Than in the Index Finger. Frontiers in Neurology, 13, 851108. https://doi.org/10.3389/fneur.2022.851108

Shibuya, K., Tsuneyama, A., Misawa, S., Suzuki, Y. I., Suichi, T., Kojima, Y., Nakamura, K., Kano, H., Ohtani, R., Aotsuka, Y., Morooka, M., Prado, M., & Kuwabara, S. (2022). Different patterns of sensory nerve involvement in chronic inflammatory demyelinating polyneuropathy subtypes. Muscle & Nerve, 66(2), 131–135. https://doi.org/10.1002/mus.27530

Tavee J. (2019). Nerve conduction studies: Basic concepts. Handbook of Clinical Neurology, 160, 217–224. https://doi.org/10.1016/B978-0-444-64032-1.00014-X

By Dr. Alex Jimenez DC, APRN, FNP-BC, CFMP, IFMCP 0 Comments Chiropractic Care, Therapy , , , , , , , , , , , , , , , , , ,

Bone Density Test and Its Importance for Health

What is a bone density test, how is it performed, and what do the results mean?

Bone Density Test

A bone density test examines bone mass, which indicates overall bone strength. Assessing bone density or mass is necessary for diagnosing osteopenia or osteoporosis, conditions that increase the risk of broken bones. The scan is performed through dual-energy X-ray absorptiometry (DEXA), which examines the thickness of the bones. Results from DEXA scans are compared to standardized values to determine whether bone density is lower than normal and whether osteopenia or osteoporosis is present.

Examination

The procedure examines bone density, or bone mass. The bones’ density, or mass, is an overall indicator of bone strength. The greater the bone density, the thicker and stronger the bones are. The test is used to diagnose osteoporosis, a condition characterized by brittle bones at risk of breaking due to significantly low bone density. A bone density test can also diagnose osteopenia, a condition characterized by lower than normal bone mass that can lead to osteoporosis. (National Institute of Arthritis and Musculoskeletal and Skin Diseases, 2025) It is recommended that all women aged 65 and older and all men aged 70 and older have a bone density scan to screen for bone loss to help prevent fractures. (Kling J. M., Clarke B. L., & Sandhu N. P. 2014)

  • Bone density scans can establish a baseline level of bone density and track changes over time.
  • For individuals with osteoporosis or osteopenia, a bone density scan can help track how well their bones respond to treatment.

Procedure

The most common bone density test is a dual-energy X-ray absorptiometry, or DEXA, scan. A DEXA scan is similar to getting an X-ray taken, but it uses two beams to produce a more detailed and sensitive reading. (National Institute of Arthritis and Musculoskeletal and Skin Diseases, 2025)

  • During a DEXA scan, the patient will lie on their back on a table with their legs elevated on a padded platform.
  • An X-ray scanner will pass over the spine and hips while another scans beneath.
  • While the scan takes place, the patient will be asked to hold very still to obtain an accurate image.
  • The scan will obtain bone density readings from the spine and hip, the two most commonly fractured bones, and generally takes less than 30 minutes.

Results

A DEXA scan measures bone density in grams per centimeter squared (g/cm²). This number indicates how densely bone cells are packed together in a specific area of bone. This bone density reading is then compared to a standardized value to determine if bone density is within a normal range or lower than average.

For postmenopausal women and men aged 50 and older, bone density values are given a T score. The T-scores are then compared to a standardized bone density level of a healthy 30-year-old adult with peak bone density levels. (Kling J. M., Clarke B. L., & Sandhu N. P. 2014) Scores indicate the following: (Kling J. M., Clarke B. L., & Sandhu N. P., 2014)

  • Equal to minus 1.0 or above: Normal bone density
  • Between minus 1.0 and minus 2.5: Low bone density (osteopenia)
  • Equal to minus 2.5 or below: Osteoporosis
  1. Bone density values are reported as a Z score for women who have not undergone menopause and men under 50 years old.
  2. Z scores are compared to bone density levels of individuals of the same age and sex.
  3. A Z score of minus 2.0 or lower indicates low bone density, which can be caused by factors other than aging, such as medication side effects, nutritional deficiencies, or thyroid problems.

Arthritis Diagnosis 

Because a DEXA scan only measures the thickness of bones, it doesn’t work to diagnose arthritis. An X-ray of the affected joint is currently the most accurate way to diagnose arthritis. The Kellgren-Lawrence classification system categorizes the extent of arthritis based on the severity of joint damage seen on an X-ray. According to this system, arthritis can be classified as: (Kohn M. D., Sassoon A. A., & Fernando N. D. 2016)

Grade 1 (minor)

  • Minimal or no joint space narrowing, with possible bone spur formation.

Grade 2 (mild)

  • Possible joint space narrowing, with definite bone spur formation.

Grade 3 (moderate)

  • Definite joint space narrowing, moderate bone spur formation, mild sclerosis (abnormal thickening of bone), and possible deformation of bone ends.

Grade 4 (severe)

  • Severe joint space narrowing, large bone spur formation, marked sclerosis, and definite deformation of bone ends.

Injury Medical Chiropractic & Functional Medicine Clinic

Exercise can be incredibly beneficial for improving bone density, joint mobility, and the strength of surrounding muscles, which support and protect joints and bones. Talk to a healthcare provider to learn what interventions and available treatment options would be the most effective. Injury Medical Chiropractic and Functional Medicine Clinic works with primary healthcare providers and specialists to develop an optimal health and wellness solution. We focus on what works for you to relieve pain, restore function, and prevent injury. Regarding musculoskeletal pain, specialists like chiropractors, acupuncturists, and massage therapists can help mitigate the pain through spinal adjustments that help the body realign itself. They can also work with other medical professionals to integrate a treatment plan to resolve musculoskeletal issues.

Osteoporosis

References

National Institute of Arthritis and Musculoskeletal and Skin Diseases. (2025). Bone mineral density tests: what the numbers mean. Retrieved from https://www.niams.nih.gov/health-topics/bone-mineral-density-tests-what-numbers-mean

Kling, J. M., Clarke, B. L., & Sandhu, N. P. (2014). Osteoporosis prevention, screening, and treatment: a review. Journal of women’s health (2002), 23(7), 563–572. https://doi.org/10.1089/jwh.2013.4611

Kohn, M. D., Sassoon, A. A., & Fernando, N. D. (2016). Classifications in Brief: Kellgren-Lawrence Classification of Osteoarthritis. Clinical orthopaedics and related research, 474(8), 1886–1893. https://doi.org/10.1007/s11999-016-4732-4