Neurologists use a surprisingly wide range of tools, from simple handheld instruments that cost a few dollars to imaging machines worth millions. A standard neurological exam starts with basic physical tools you can see and feel, then may progress to advanced imaging, electrical recordings, or lab procedures depending on what the neurologist finds. Here’s what each tool does and why it matters.
Bedside Exam Tools
The neurological exam begins with a handful of low-tech instruments that test reflexes, sensation, strength, and cranial nerve function. These tools are inexpensive and portable, but they give neurologists a remarkable amount of information about how your nervous system is working.
A reflex hammer is probably the most iconic neurology tool. When tapped on a tendon at the knee, elbow, or ankle, it triggers an involuntary muscle contraction. The speed, strength, and symmetry of your reflexes tell the neurologist whether your spinal cord pathways and motor nerves are intact. The two most common styles are the Taylor hammer (a triangular rubber head on a metal handle) and the Tromner hammer (a two-headed design that allows more precise tapping on smaller tendons).
A tuning fork, typically vibrating at 128 Hz, tests your ability to sense vibration. The neurologist strikes the fork and places its base against your toe, ankle, or finger. If you can’t feel the buzzing, it suggests damage to the sensory nerves that carry vibration signals up through the spinal cord. This is one of the quickest ways to screen for peripheral neuropathy, especially in people with diabetes. Higher-frequency forks (256 Hz and 512 Hz) are used for hearing tests rather than vibration.
A 10-gram monofilament is a thin nylon filament that bends at a precise pressure when pressed against the skin. It’s the standard screening tool for loss of protective sensation in the feet, which affects millions of people with diabetic neuropathy. If you can’t feel the monofilament touching the sole of your foot, you’re at higher risk for unnoticed injuries and ulcers.
Other bedside tools include a Wartenberg pinwheel (a small spiked wheel rolled across the skin to test pain sensation), a penlight (to check how your pupils react to light), and an ophthalmoscope (a handheld device that shines light into your eye so the neurologist can directly examine the optic nerve and blood vessels at the back of the retina). Swelling of the optic nerve, visible through the ophthalmoscope, can signal increased pressure inside the skull.
Cognitive Screening Tests
These aren’t physical tools but standardized pen-and-paper assessments that neurologists use to measure memory, attention, language, and reasoning. The two most common are the Mini-Mental State Exam (MMSE) and the Montreal Cognitive Assessment (MoCA).
The MMSE is scored out of 30 points, with scores below 24 generally suggesting cognitive impairment. The MoCA, also scored out of 30, uses a cutoff below 26 and is considered more sensitive at catching mild cognitive impairment that the MMSE might miss. Both tests adjust for education level, since someone with more years of schooling would be expected to score higher. These quick assessments, which take about 10 minutes, help neurologists decide whether more detailed neuropsychological testing or brain imaging is warranted.
Brain Imaging: MRI, CT, and PET
When the physical exam raises concerns, neurologists often turn to imaging to look at the brain and spinal cord directly. Each type of scan serves a different purpose.
MRI (magnetic resonance imaging) is the workhorse of neurology. It uses powerful magnets and radio waves to produce detailed images of soft tissue, making it ideal for detecting tumors, multiple sclerosis lesions, strokes, and structural abnormalities. An MRI scan typically takes 30 to 60 minutes, during which you lie still inside a narrow tube. Some scans require an injected contrast dye to highlight areas of inflammation or abnormal blood vessels.
CT (computed tomography) uses X-rays to create cross-sectional images of the brain. It’s much faster than MRI, often finishing in under a minute, which makes it the go-to tool in emergencies like suspected strokes or head trauma. CT is better at detecting fresh bleeding in the brain, while MRI is better at showing subtle tissue changes.
PET (positron emission tomography) works differently from both. It uses a small amount of radioactive tracer injected into a vein to measure metabolic activity in the brain. A common tracer measures glucose metabolism, which helps distinguish active tumor growth from scar tissue left by radiation treatment. Specialized PET tracers can detect the amyloid protein plaques associated with Alzheimer’s disease, giving neurologists a way to confirm the diagnosis in living patients rather than relying solely on cognitive tests. Other tracers measure dopamine metabolism, which is useful for evaluating Parkinson’s disease and related movement disorders. Most modern PET scanners are combined with a CT or MRI scanner in a single machine, producing both metabolic and structural images at once.
Electrical Recording: EEG and EMG
The brain and nerves communicate through electrical signals, and neurologists can record those signals directly using two key technologies.
An EEG (electroencephalogram) measures electrical activity in the brain. Small adhesive electrodes are placed across your scalp, each one picking up the tiny voltage changes produced by groups of brain cells firing together. The neurologist reads the resulting waveforms to diagnose epilepsy, identify seizure types, evaluate unexplained episodes of altered consciousness, and monitor brain function during certain surgeries. During the test, you recline in a chair or bed while a technician may ask you to open and close your eyes, breathe deeply, or look at flashing lights. These stimuli are designed to provoke abnormal brain activity if it’s present. A routine EEG takes about 30 minutes, though some patients wear a portable EEG monitor for 24 hours or longer to catch seizures that don’t happen on demand.
EMG (electromyography) and nerve conduction studies are usually performed together to evaluate problems with peripheral nerves and muscles. In a nerve conduction study, small electrodes on the skin deliver brief electrical pulses to a nerve, and sensors downstream measure how fast the signal travels and how strong it is. Slow conduction speed points to nerve damage. The EMG portion involves a thin needle electrode inserted into a muscle to record its electrical activity at rest and during contraction. Together, these tests help diagnose conditions like carpal tunnel syndrome, pinched nerves, and neuromuscular diseases. The equipment includes amplifiers, filters, and signal-processing software that clean up the tiny electrical signals so the neurologist can interpret them accurately.
Lumbar Puncture
A lumbar puncture, sometimes called a spinal tap, collects a small sample of cerebrospinal fluid (the clear liquid that surrounds the brain and spinal cord). This fluid can reveal infections like meningitis, inflammatory conditions like multiple sclerosis, and abnormal proteins associated with certain cancers or neurodegenerative diseases.
The procedure uses a thin spinal needle (typically 20 or 22 gauge) inserted between two vertebrae in the lower back. You either lie on your side with your knees pulled toward your chest or sit leaning forward, both positions designed to open the spaces between vertebrae. A manometer, a simple vertical tube attached to the needle, measures the opening pressure of the fluid, which can indicate whether pressure inside the skull is abnormally high. The fluid is collected in small sample vials and sent to a lab for analysis. Afterward, you’re typically asked to lie flat for one to two hours to reduce the chance of developing a headache caused by temporarily low spinal fluid levels.
Autonomic Function Testing
When neurologists suspect a problem with the autonomic nervous system, the part that controls heart rate, blood pressure, sweating, and digestion, they use specialized equipment to provoke and measure the body’s automatic responses.
The tilt table test is the most well-known of these. You lie flat on a motorized table with straps holding you in place while electrodes on your chest monitor your heart rhythm and a cuff on your arm or wrist tracks blood pressure continuously. A clip on your fingertip measures oxygen levels. The table then tilts you upright, usually to about 70 degrees, simulating the act of standing. Your care team watches for abnormal drops in blood pressure or spikes in heart rate that would explain fainting spells, dizziness, or other symptoms of dysautonomia. The test typically lasts 30 to 45 minutes, and in some cases, medication is given through an IV line to make the test more sensitive.
AI-Assisted Analysis Software
Neurologists increasingly use software tools that apply artificial intelligence to analyze brain scans. One FDA-cleared example is Pixyl.Neuro, an AI platform that automatically analyzes brain MRIs to detect signs of neurological disease activity. In clinical use, it has demonstrated detection rates up to 28% higher than standard reading alone and is now used in more than 12 countries. For patients with multiple sclerosis, this kind of software is particularly valuable: it can flag subtle new lesions that a human reader might overlook, while also confirming that the roughly 83% of routine MS scans showing stable disease are truly unchanged. These tools don’t replace the neurologist’s judgment, but they speed up scan interpretation and add a second layer of analysis.