Diagnosis starts in the delivery room and unfolds across the first weeks of life. Physical exam, imaging, and nerve conduction studies together build the picture — and the sooner that picture comes into focus, the better the outcomes.
Medically reviewed
Updated May 2026
~ min read
Hours, not days
Initial exam typically happens in the first hours of life
Multi-step
Physical exam, imaging, and nerve studies in combination
Specialist-led
Pediatric neurologists guide the workup and findings
The Erb’s palsy diagnosis process is a critical journey for families and healthcare professionals. The condition arises from a brachial plexus injury, which can significantly impact a newborn’s arm function. Timely, accurate diagnosis ensures the right treatment and support. The process combines physical examination, clinical evaluation, and medical tests — aiming for both early intervention and long-term planning.
This page walks through assessment steps, the role of pediatric neurology, clinical evaluation, and medical tests used to confirm Erb’s palsy. For the broader picture, see Erb’s palsy overview.
Assessment begins right in the delivery room or shortly after birth — especially when birth-related nerve injury is suspected. Early detection allows immediate intervention and improves prognosis.
Initial physical examination for newborns
Thorough check shortly after birth
Muscle tone, reflexes, and motor responses assessed
Asymmetries in movement or signs of weakness noted
Rapid identification triggers further diagnostic procedures
Understanding birth-related nerve injury
Often from excessive force on head, neck, or shoulders during delivery
Damage to the brachial plexus is the most common mechanism
Diagnosis combines clinical evaluation with specific medical tests — identifying the extent of nerve damage and associated muscle weakness. A multidisciplinary team, including pediatric neurologists, is central to the process.
What the workup includes
The diagnostic toolkit typically combines:
Detailed physical exam by a pediatric neurologist
Birth history and obstetric review
Imaging (MRI, ultrasound, X-ray as appropriate)
Nerve conduction studies and EMG
Repeat assessments at 1, 3, and 6 months
Role of pediatric neurology in diagnosis
Specialized knowledge of the nervous system
Detailed assessments and interpretation of test results
Determine exact nature and extent of nerve damage
Recommend specific interventions and therapies
Evaluating newborn muscle weakness
Observation of movement and stimulus response
Particular focus on arm and hand function
Distinguish from other neurological issues
Establishes baseline for measuring progress
Clinical evaluation for Erb's palsy
A thorough clinical evaluation investigates potential symptoms and the timeline of nerve injury. Pediatric neurology expertise combined with knowledge of obstetric complications during delivery forms the backbone of this assessment.
Importance of nerve conduction studies
Measure speed and strength of nerve signals
Quantifiable data on nerve function
Helps determine brachial plexus injury severity
Guides management plan and prediction of recovery
Assessing nerve damage in infants
Combination of observational assessments and imaging
Grasp and arm movement evaluations
Visualization of nerve damage extent
Foundation for personalized treatment plans
Medical tests for Erb's palsy
Medical tests confirm the presence of nerve injuries and define their scope. Physical examinations combined with advanced nerve damage assessment techniques ensure the diagnosis is accurate and comprehensive.
Diagnostic criteria and procedures
Combination of clinical signs, history, and testing outcomes
Electromyography (EMG) for muscle electrical activity
Imaging studies for structural visualization
Differentiates Erb’s palsy from similar conditions
Timeline for Erb's palsy diagnosis
Often begins immediately after birth if symptoms are apparent
May unfold over weeks as subtler signs emerge
Earlier detection means earlier intervention
Long-term complications minimized with prompt action
If excessive force or improper delivery technique contributed to your child’s Erb’s palsy, a legal claim can recover the cost of therapy, surgery, and lifetime care. Specialized birth injury lawyers can review your case at no cost.
Frequently asked questions about Erb's palsy diagnosis
Erb’s palsy is weakness or paralysis of the arm due to injury to the brachial plexus nerves — typically occurring during birth. It affects movement and sensation in the shoulder, arm, and hand.
Through a combination of physical examination and medical history review. Doctors may also use imaging tests like MRI, ultrasound, or X-rays to assess the extent of nerve damage.
Often from shoulder dystocia during childbirth — the baby’s shoulder gets stuck behind the mother’s pelvic bone, stretching or tearing the nerves. See Erb’s palsy risk factors.
As soon as symptoms such as lack of movement or weakness in the arm are noticed. Early diagnosis leads to more effective treatments and better outcomes.
Costs vary by provider and tests like imaging. Check with your insurance about coverage for diagnostic procedures.
Early diagnosis allows timely intervention — significantly improving the chances of recovery. Early physical therapy strengthens muscles and improves arm function.
Though rare, misdiagnosis can occur, especially with mild symptoms. A thorough examination by a specialist and appropriate imaging tests help ensure accuracy.