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Doctor insights on: Nerve Damage Tests

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Please tell me if there is a test to determine nerve damage?

Please tell me if there is a test to determine nerve damage?

EMG/NCS: The best study to evaluate nerve injury is emg/ncs - nerve conduction study. These are preformed by a neurologist. It involves placing small needles and passing a small amount of current through them.
Good luck. ...Read more

Dr. Olav Jaren
1,345 Doctors shared insights

Nerve Damage (Definition)

A complete nerve transection will leave an area totally numb. The distribution of the numbers depends upon where the nerve was cut. A partial nerve injury may leave the area tingly or incompletely numb. Finally even if the nerve is not cut the swelling and bruising to the tea can affect the nerve as well. Usually we consider sharp penetrating injuries as likely having nerve lacerations when sensation is lost. A hand surgeon can examine the hand and pinpoint the site or extent of nerve injury and recommend ...Read more


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Help! Need to know if there's a test to determine nerve damage?

Help! Need to know if there's a test to determine nerve damage?

Nerve damage: Can be detected via electrical studies such as electromyogram and nerve conduction studies. Under certain conditions, nerve biopsy can aid in the etiology. ...Read more

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EMG and NCV. Which test will be better to detect nerve damage.?

EMG and NCV. Which test will be better to detect nerve damage.?

Often you: Need both. The NCS will check on how fast the nerves are working and the EMG will make sure the muscle is getting adequate nerve impulses. ...Read more

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Can nerve damage from a stroke always be found in an emg test?

Can nerve damage from a stroke always be found in an emg test?

Not always: Depending on the amount of damage to the brain tissue, abnormalities on EMG may not always show up. This is especially true in instances where there are upper motor neuron issues, say something dealing with coordination or movement, may not demonstrate changes in emg. Also, there has to be enough time for nerve damage to progress to show abnormalities in peripheral injuries. Hope that helps! ...Read more

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Can a chiropractor make a referral for tests for nerve damage?

Yes: It is a rare chiropractor who can make this diagnosis let alone give a referral to a real doctor. But in most states and most insurance plans, they can make a referral for nerve damage. ...Read more

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Two part? What's the difference bettween an EMG and nerve conduction test AND is it more painful or less if you have nerve damage?

Two part? What's the difference bettween an EMG and nerve conduction test AND is it more painful or less if you have nerve damage?

There are two parts: Nerve conduction study: Electrodes are put on skin over a nerve. Mild electric shocks (not painful) cause axons to transmit action potentials (nerve impulses). Velocity & amplitude (speed & strength) of impulses are measured. This measures nerve's function. Electromyogram: Needle electrodes are stuck in muscles innervated by a nerve. Electrical activity of muscle => data on nerve function. ...Read more

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What is an rrt medical test for vagus nerve damage?

Test CN IX and X: Neurologic exam for cranial nerves ix and x is performed simultaneously. We are looking for the soft palate elevation and gag reflex. Introduce tongue depressor in the back of the throat touching lightly the roof of the mouth.
Abnormality - asymmetrical
exam of localization - brain stem
mri to rule out pathology. ...Read more

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Can vit B12 deficiency cause permanent nerve damage? If yes, how to know? Is there a test or a procedure to see visually the nerve damage?

Check Homocysteine: Elevated homocysteine levels are a good marker for nerve damage due to B12 and Folic Acid deficiency. Even with normal levels of these two chemicals your body may not be able to use and you need to take the methyl- varieties and can lead to functional deficiency leading to neuropathy. There is test that looks at the small fibers that get affected by these conditions and diabetes. Ask your doc. ...Read more

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Field vision test normal. 30% optic nerve damage. Is glaucoma in early stage?

Field vision test normal. 30% optic nerve damage. Is glaucoma in early stage?

Yes: Need more information. Who and how did they claim or detect 30% optic nerve damage? If field is normal, that is a good sign (how did they test this or make that claim?). You need to see an ophthalmologist. ...Read more

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Will an EMG test diagnose nerve damage causing cauda equina symptoms or would NCV have to be done too?

Will an EMG test diagnose nerve damage causing cauda equina symptoms or would NCV have to be done too?

EMG/NCV: These tests look at muscle activity and time needed for nerve conduction. Abnormalities usually take several weeks to show up on the test. So if you have had symptoms from compression in caudal equina for quite some time, it may reflect on these studies. (on the other hand 'caudal equine syndrome' is a surgical emergency and needs to be addressed right away. ...Read more

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On average what percentage of optic nerve damage must there be in order to show a loss of peripheral vision on a field test?

Very sensitive: Formal visual field testing can pick up very small defects due to optic nerve damage. The test can be affectedy your ability to stay focused however. ...Read more

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I have cut down my wrist with blades. Blood has stopped. But m worried if there is any nerve damage. They are very deep cuts. How to test for nerve i?

I have cut down my wrist with blades. Blood has stopped. But m worried if there is any nerve damage. They are very deep cuts. How to test for nerve i?

EMG: First of all, even if the bleeding has stopped if you have really cut your wrists you need immediate medical attention in an emergency room setting.
If you had nerve damage there would be symptoms in the hands of numbness or tingling and an EMG could be performed, but what I have stated in the first paragraph is far more urgent. ...Read more

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Can neurophathy emg test in lower back tell you if you have upper body or hand nerve damage as well?

Can neurophathy emg test in lower back tell you if you have upper body or hand nerve damage as well?

No: Emg of muscles in your low back and legs looks only at the lumbar roots, while nerve conduction studies (ncs) check nerves in your legs & feet. To check the cervical nerve roots in your neck you would need EMG of the muscles in your arms and hands, and possibly muscles in your neck. To check nerves in your arms and hands (carpal tunnel), you would need ncs of the arms and hands. ...Read more

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Is there any test or scan to find out permanent nerve damage occurring due to vitamin B12 deficiency?

Is there any test or scan to find out permanent nerve damage occurring due to vitamin B12 deficiency?

Yes: Usually in a young person with adequate replacemnt therapy (for life) the problems resolve. Somatosensory evoked potentials for cord involvemnt, ncv for periperal nerve involvment, cognitive testing and blood tests (cbc and b12) are available if problems persist beyond 1 year. Be sure to keep your serum B12 level above 350 or preferably above 450 if you've suffered neurological injury. ...Read more

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Is there a test to find out what is causing a burning sensation in my toe? Ie: psble nerve damage, nerve block from anesthia injections?

Is there a test to find out what is causing a burning sensation in my toe? Ie: psble nerve damage, nerve block from anesthia injections?

Nerve pain: An electromyogram and nerve conduction study can identify the cause of the burning in the foot. There are a battery of blood tests that range from B12 levels and thyroid function to blood sugar and inflammatory markers to test for neuropathy. See a neurologist for evaluation and treatment. ...Read more

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Does nerve conductive study and emg prove nerve damage or nerve pain like sciatica? Can you have sciatic pain and normal results ftom these tests

Shows function loss: Emg and nerve conduction studies are very good at detecting nerves that have been damaged to the point where the nerves are losing function, but are not always sensitive to less severe damage that is causing nerve irritation without loss of function, or to disease elsewhere in the body, such as in the brain or spinal cord. ...Read more

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I have nerve damage my doctor thinks might be diabetic shouldn't this have been seen before through other blood test even tho thts not what I was teste?

I have nerve damage my doctor thinks might be diabetic shouldn't this have been seen before through other blood test even tho thts not what I was teste?

No!!: There is no blood test that makes diagnosis

can be looked for by physical exam by md, or symptoms alone can suggest it, with exam and occasionally uncomfortable test= EMG done to formalize diagnosis. ...Read more

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Glaucoma in 1 eye. 30% nerve damage w/"normal" field of vision test reading. How much peripheral would be lost before it affects driving?

Glaucoma in 1 eye. 30% nerve damage w/"normal" field of vision test reading. How much peripheral would be lost before it affects driving?

Depends: On the location of the loss and how close it is to the center of fixation. Variable effects on driving. ...Read more

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Why wouldn't an MRI show anything wrong with severe pain? Can you accurately test for pyriformis syndrome? If it is nerve damage will Neurontin (gabapentin) help?

Why wouldn't an MRI show anything wrong with severe pain? Can you accurately test for pyriformis syndrome? If it is nerve damage will Neurontin (gabapentin) help?

Anatomy: Pain is a feeling not an anatomical abnormality. If there is no anatomical abnormality then there is no cause of the pain diagnosed on the MRI. ...Read more

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Damage to vagus nerve brain tumor at brainstem removed in 1993 regrowth 2004 now stable. What doctors test vagus nerve damage and how?

Damage to vagus nerve brain tumor at brainstem removed in 1993 regrowth 2004 now stable. What doctors test vagus nerve damage and how?

Vagus nerve: The vagus nerve can be activated by bearing down as you would having a bowel movement. This results in increased vagal tone which temporarily slows the heart rate. Making yourself gag by putting your finger in the back of your throat also activates the vagus nerve resulting in transient slowing of the heart rate. I would ask a neurologist if these maneuvers are valid measures of vagus nerve integr ...Read more

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Gastro paresis, high BG fasting, extreme fatigue, pins/needles, majority of nerve damage symptoms, blurred vision, etc but all tests negative for diab?

Gastro paresis, high BG fasting, extreme fatigue, pins/needles, majority of nerve damage symptoms, blurred vision, etc but all tests negative for diab?

Polyneuropathy...: What you describe is a polyneuropathy or mononeuropathy multiplex. The most common cause prob is DM but it is far from only & you say all tests for DM neg, 'all' is a very strong comment & some people get neuropathies w/pre-DM. What rests were done. Any one can be "false neg'. Also many non-DM causes: B12 def, MS, vasculitis, HIV, CIDP, immune...need more info! DM poss, but also many other poss. ...Read more

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Weakness + shooting pain in arm, wrist, clawing of 3rd and little figure. Clear nerve conduction test, what else could it be other than nerve damage?

See hand surgeon: You may possess a rheumatological condition affecting tendons in wrist and hand, but if nerve testing was done within 3-4 weeks of onset, an emerging nerve problem could be missed. Sounds like a significant problem. See a hand specialist, and get expert advice. ...Read more

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Can nerve damage cause this on & off upper left back and left chest pain (twitching, burning)or what can it be?!? Had ECG stress test normal 1 year ago

Nerves twich & burn: It would be highly unusual to find these symptoms attributed to the heart in a 21 year-old. Damage or pathology involving nerves (peripheral or central) is the most likely explanation for these symptoms. Non-organic causes are also possible if symptoms are unchanged over the past year. ...Read more

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My husband was diagnosed with amaurosis fugax. Opthlmic tests show no optic nerve damage. Carotid ultrsound and echocardiogram both neg. What next?

My husband was diagnosed with amaurosis fugax. Opthlmic tests show no optic nerve damage. Carotid ultrsound and echocardiogram both neg. What next?

Amayrosis fugax: Amaurosis fugax is transient loss of vision in one eye from circulatory issues. One of the causes is a clot from neck arteries or heart going into the eye through blood stream. There are other causes to be considered like glaucoma, vasculitis (inflammation of blood vessels especially giant cell arteritis) coagulation disorder. If all work up is negative, chance of recurrence is very low. ...Read more

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Have glaucoma w/30% optic nerve damage. Being treated with eye drop that has lowered pressure. Visual field. Test good. What is prognosis long term?

Have glaucoma w/30% optic nerve damage. Being treated with eye drop that has lowered pressure. Visual field. Test good. What is prognosis long term?

Good: Glaucoma is a treatable disease.
If you are attentive to use the meds prescribed, have the pressure checked and periodic visual field your disease is well followed. If there is any tendency toward worsening there are other surgical option to address is. ...Read more

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2nd opinion for spinal accessory nerve damage had surgery in jan. To remove a branchial cleft cyst and have damage to spinal nerve, had nerve test done and was told physical therapy and see what happens after 3 months. Should I get a second opinion or wha

The: The spinal accessory nerve, also known as "cranial nerve xi" (xi meaning "eleven") is a nerve in the region of the neck that moves two important muscles: the trapezius and the sternocleidomastoid. The trapezius is the muscle that (among other things) shrugs the shoulder. The sternocleidomastoid is a muscle that (among other things) tilts the head. These are important functions, and damage to the nerve can be significant depending on other circumstances.

While most peripheral nerve injuries do get better, especially with physical therapy, some do not. Even if recovery is incomplete, there may be no reduced ability to perform routine activities. Loss of ability is a concept that is relative: a graphic artist might have different demands for those muscles than a circus performer, for example.

The decision to get a second opinion is often based on the severity of problems, the complexity of problems, or the degree of trust in the competency of the physician or surgeon who offered the first opinion. Most doctors welcome the decision of a patient to get a second opinion, particularly if the stakes are high. ...Read more

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Nerve damage spine had neck surgery 2008 in 2009 had huge back surgery cut me across my stomach I never been the same I am so numb test show l1-l5.

Sorry to hear that: Typically, if there is any nerve damage, you will have to live with it, as it likely going to stay with you. Get emg/ncs ; evaluate if there is nerve damage. See a spine surgeon for evaluation. He/she will ensure there is no compressive pathology existing in your spine. If things are well decompressed, then no surgery will be recommended. Dorsal column stimulation may offer help in some patients. ...Read more

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Can nerve damage heal?

Yes: If the damage does not cause the nerve to be completely cut, then healing can occur. If a nerve has been cut, it will need to be reconnected in order to grow. Nerve grows about 1 mm/day, so depending on where the injury is, it may take over a year for recovery. It is difficult after a nerve is cut to get 100% recovery, but some return of sensation can be expected after repair. ...Read more

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Can nerve damage repair itself?

Can nerve damage repair itself?

Sometimes: A broad question, because there are many ways a nerve can be damaged: compression (carpal tunnel), crush, cut, etc. A "bruised" nerve can heal itself; it grows back at about 1 inch/month. If the nerve is divided, it may occasionally heal, but more often needs surgical repair--and this doesn't always result in return of function. ...Read more

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Does a m r I show nerve damage?

Does a m r I show nerve damage?

Not really: An EMG is the best test for nerve damage. The MRI can show evidence of compression or damage but cannot quantitate it or really confirm its extent. In most cases. ...Read more

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Can nerve damage reverse itself?

Can nerve damage reverse itself?

Variable: Generically, if only the coverings of a nerve are involved (myelin), and healing begins, it will take about 4 weeks. If the central portion of the nerve fibre is involved (axon), recovery is the speed of finger nail growth (.1 mm daily). Depends on location, causation, and whether successful treatment is available. ...Read more

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How permanent can nerve damage be?

Very permanent: Your question is not open to an answer because you offer no specifics. What nerve? How severe is the involvement? ...Read more

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How to know if I have nerve damage?

Nerve damage?: Please consult with your primary care physician or a neurologist for a thorough exam. ...Read more

Dr. Sam Markzar
785 Doctors shared insights

Neuropraxia (Definition)

Neuropraxia is defined as a temporary loss of function of the nerve. Some nerves are purely sensory while others carry both sensory and motor fibers. Traumatic contusion injuries to nerves or nerve compressions can cause Neuropraxia. Sensory nerves like sural nerve in the leg or mixed sensory and motor nerves like the median and ulnar nerves in the forearm & hand ...Read more


Nerve (Definition)

The brain and spinal cord communicates with what is occurring in the internal organs and limbs by nerve fibers where are like electrical wires with insulation (myelin) and the "copper" (axon). Within brain and spinal cord these nerves connect to other nerves via synapses on both axons and dendrites. A nerve can carry information regarding sensations, and ...Read more