Diagnostic Workup for a Positive Romberg Sign

Clinical Assessment

A positive Romberg sign reflects dysfunction of the dorsal‑column proprioceptive pathways, so the initial evaluation should focus on identifying structural lesions of the brain and spinal cord with MRI, followed by targeted metabolic and infectious laboratory testing. 1
Sensory (proprioceptive) ataxia is characterized by marked instability only when the eyes are closed, confirming dorsal‑column involvement. 1
Vestibular ataxia presents with instability, nystagmus, and vertigo that may worsen on compliant surfaces, helping to differentiate it from sensory ataxia. 2

First‑line imaging: MRI of the brain and cervical/thoracic spine without intravenous contrast is recommended to detect structural lesions that can impair dorsal‑column function (e.g., spinal cord compression, demyelination, infarction, tumors). [1][3]
MRI also evaluates the posterior fossa for cerebellar pathology when cerebellar involvement is suspected and assesses the brainstem for lesions affecting proprioceptive pathways. [1][3]
Intravenous contrast should be added when an inflammatory or infectious process (e.g., transverse myelitis, abscess) is suspected or when a neoplastic etiology is a concern. 2

Vitamin B12 and methylmalonic acid – essential to rule out subacute combined degeneration, a reversible cause of dorsal‑column dysfunction. 4
Hemoglobin A1c and fasting glucose – screen for diabetic neuropathy, a common contributor to proprioceptive loss. 4
Thyroid‑stimulating hormone (TSH) – identifies hypothyroidism‑related peripheral neuropathy. 4
Complete blood count – detects anemia, infection, or hematologic malignancy that may underlie neurological symptoms. 4
Copper and ceruloplasmin – assess for copper‑deficiency myelopathy, which mimics B12 deficiency but requires different treatment. 4
HIV testing – evaluates for HIV‑associated myelopathy. 4
Lyme serology – indicated when exposure in endemic areas is possible. 4
Paraneoplastic antibody panel – ordered if a paraneoplastic syndrome is suspected. 4
Heavy‑metal screening – considered for patients with relevant occupational or environmental exposures. 4

Nerve conduction studies and electromyography are indicated when peripheral neuropathy is a differential diagnosis; they differentiate peripheral from central pathology, identify large‑fiber sensory neuropathies, and quantify severity. 4

Lumbar puncture is warranted if MRI reveals demyelinating lesions to assess for multiple sclerosis (oligoclonal bands, IgG index). 4
It is also useful when Guillain‑Barré syndrome or chronic inflammatory demyelinating polyneuropathy is suspected (elevated protein with albuminocytologic dissociation). 4
When an infectious cause such as neurosyphilis or Lyme disease is considered, cerebrospinal fluid analysis helps confirm the diagnosis. 4
Vestibular function testing (head‑impulse test, vestibular‑evoked myogenic potentials) should be performed if the distinction between sensory and vestibular ataxia remains unclear. 2

Misattributing a positive Romberg to cerebellar disease – the sign specifically indicates sensory pathway dysfunction, not cerebellar pathology. 1
Using CT instead of MRI – CT lacks sufficient sensitivity for spinal cord and posterior‑fossa lesions relevant to a positive Romberg. [1][3]
Delaying vitamin B12 assessment – subacute combined degeneration can progress rapidly but is reversible with early treatment. 4
Overlooking copper deficiency – an increasingly recognized mimic of B12 deficiency that requires distinct management. 4
Neglecting medication history – agents such as certain chemotherapies, metronidazole, and isoniazid can cause sensory neuropathy. 4

Acute onset (hours–days): Prioritize MRI to exclude stroke, transverse myelitis, or acute spinal cord compression; consider Guillain‑Barré syndrome if areflexia is present. [3][4]
Subacute onset (weeks–months): Focus investigations on nutritional deficiencies (B12, copper), inflammatory disorders, and infectious etiologies. 4
Chronic progressive course: Evaluate for hereditary sensory neuropathies, paraneoplastic syndromes, or degenerative neuro‑muscular conditions. 4

The American College of Radiology indicates that Romberg's sign evaluates the function of the dorsal columns of the spinal cord, responsible for proprioception 5

The patient should stand with feet together and arms at their sides during the traditional Romberg test, as recommended by the American Academy of Pediatrics 6
The test should be performed in a safe environment to prevent falls, as suggested by the American Academy of Pediatrics 6
The American Journal of Respiratory and Critical Care Medicine recommends observing the patient for at least 20-30 seconds with their eyes closed during the test 7

The American College of Radiology suggests that a positive Romberg sign indicates a deficit in proprioceptive pathways, particularly in the dorsal columns of the spinal cord 5
The American College of Radiology also notes that ataxia sensorial can be distinguished from ataxia cerebelosa by the presence of significant instability or only instability with eyes closed (Romberg positive) 5
The Journal of the American College of Radiology recommends distinguishing between ataxia cerebelosa, ataxia sensorial, and ataxia vestibular based on the presence of instability with eyes open or closed, and other characteristics such as vertigo 8
The American Journal of Respiratory and Critical Care Medicine suggests that the Romberg test can be used to monitor adverse effects of medications such as streptomycin, with tests performed at the start and during treatment 7
The Journal of the American College of Radiology notes that in the evaluation of ataxia in children, a positive Romberg sign suggests specific dysfunction of the dorsal columns 9

The American Academy of Pediatrics recommends ensuring the testing environment is safe to prevent injury and positioning close enough to catch the patient if they begin to fall 10
The tester should be prepared to catch the patient if significant instability occurs, particularly when the patient's eyes are closed 10

The American Academy of Otolaryngology-Head and Neck Surgery suggests considering using additional assistance for obese patients or those with significant baseline instability 11
The American Academy of Otolaryngology-Head and Neck Surgery recommends avoiding the Romberg test in patients with severe cervical stenosis, vertebrobasilar insufficiency, or significant vascular disease where rapid position changes pose risk 11