Hi, I am an American Board Certified Neurologist with vast experience in diagnosing & treating all types of neurological & other medical conditions including the concerns of “Multiple new symptoms & EMG test report interpretation” you have mentioned here and I am very glad to help you with your health concerns.
Your EMG test (EMG & Nerve Conduction Test) shows there are findings suggestive of median nerve involvement on the left side and this type of findings can be seen with CTS, especially early stages.
But please see this emg test has not helped much to explain your symptoms. You seem to have more diffuse symptoms, for example you also have some proximal upper limb symptoms and symptoms in the neck areas too and this test has not provided any explanation for these symptoms. You also have a finding of absent F response in the left peroneal nerve, this is one of the nerves in the leg and this also possibly points towards some more diffuse process rather than just some localized entrapment neuropathy of the hand like cts.
For example you may be suffering from radiculopathy which is pinched spinal nerve roots in the spine. This can occur due to varieties of spinal conditions including arthritis, discs etc. The pinching of the spinal nerves can explain your symptoms in the proximal upper limbs too along with the neck symptoms. The absent f response of peroneal nerve in the leg may be suspicious for pinched spinal nerve root at L 5 level in the lumbar spine. Based on this report although it seems this test has not identified any cervical radiculopathy but please see the emg test does not pick the radiculopathy always, it can miss this condition and an MRI of the spine is the best test to rule in or rule out radiculopathy (discussed again below later)
Although this emg/nerve conduction test has not revealed any definitive peripheral neuropathy findings however in early stages this test may show mild findings like this, which can be confused with entrapment neuropathies like cts, which means the emg findings themselves are not enough to confirm the diagnosis in the early stages of neuropathies so we need to explore further. Since you are vegan so there is possibility for nutritional neuropathy for example vit b12 deficiency can cause neuropathy and can produce the symptoms you are having. Although this emg test has not helped much in this regard however you need a blood test (if not already done) to look for vit b12 deficiency and in early stages of the neuropathy the emg test may not always reveal neuropathy whereas the blood vit b12 level can help in confidently ruling in or ruling out b12 deficiency.
You also need an MRI of the cervical spine to explain the upper limb symptoms as well as the emg test findings, and also an MRI of the lumbar spine to explain the emg test finding & the left leg symptoms, and this will help in ruling out any spinal conditions causing your symptoms. If you feel the symptoms are one sided, for example only on left sided then an MRI of the brain too is a consideration because such one sided symptoms require ruling out brain conditions too.
If not already done you also need blood tests to rule out thyroid disease, and autoimmune connective tissue disorder etc because these conditions too can present with the type of symptoms you are having. If you are having risk for lyme disease then you need lyme tests too (if not already tested).
As you see there are various possibilities and you certainly need further testing and we cannot really stop just with this emg test report because this emg test has really not helped much to explain your symptoms. You may be having some cts too but the point is your symptoms are not restricted just to the carpal tunnel syndrome area, rather the symptoms are more diffuse and outside the median nerve territory too (for example the proximal arm & the leg are certainly not supplied the carpal tunnel median nerve) - so further testing is necessary (MRI scans, additional blood testing etc) to ascertain the precise cause for your symptoms and then treated appropriately depending upon the test results.
Please let me know if you have any further questions, and please click a positive rating (preferably 5 Star/Excellent) to credit for the time & effort put by me in answering your health question, and this is the only way I will be credited for my service to you. If you have follow-up or additional questions you can ask them after the rating too.