Diagnostic tool · Objective exam and labs

Functional, Neurological, and Lab Testing After a Car Accident

Imaging shows structure. Functional testing shows what your injury does to your body: how far you can move, how strong you are, how your nerves respond, and how much it limits daily life. We measure it in numbers, track it over time, and order lab work when the clinical picture calls for it.

  • Measured, not estimated
  • Tracked visit to visit
  • Validated scoring tools
Functional & lab tests

Why objective testing matters

What is functional testing?

Functional testing turns a physical exam into objective, repeatable measurements: range of motion in degrees, muscle strength on the 0–5 Medical Research Council scale, reflexes on a 0–4+ scale, sensation by dermatome, provocative tests that reproduce specific injuries, and validated questionnaires such as the Neck Disability Index and Oswestry Disability Index. Laboratory tests are added when needed to check for bleeding, muscle breakdown, inflammation, infection, or safety before procedures.

“My neck hurts” is real, but it is hard to track and easy for an insurer to dismiss. “Cervical rotation 45 degrees right versus 75 degrees left, grip strength reduced on the right, Neck Disability Index 42%” is an objective finding that can be measured again next month to prove progress or show that a problem persists.

At Accident Care, your physicians and Doctors of Physical Therapy document these measurements at your evaluation and re-test them as you recover. They guide treatment decisions, show when you have reached maximum improvement, and form the backbone of the medical records your insurer or attorney will review.

How it works

What we measure, and how

Range of motion: Joint and spinal motion is measured with a goniometer or inclinometer. For the spine, dual inclinometry, the method used in the AMA Guides to the Evaluation of Permanent Impairment, separates true spinal motion from hip motion. Results are recorded in degrees and compared with the opposite side and with typical values.

Strength: Manual muscle testing uses the Medical Research Council scale, from 0 (no contraction) to 5 (normal strength). Grip strength can be measured with a dynamometer in kilograms and compared side to side. A focal pattern of weakness points to a specific nerve root or peripheral nerve.

Neurological screening: Sensation is mapped by dermatome, strength by myotome, and deep tendon reflexes are graded 0 to 4+: biceps (C5), brachioradialis (C6), triceps (C7), patellar (L4), and Achilles (S1). Upper motor neuron signs such as a Hoffmann sign, Babinski sign, or clonus can indicate spinal cord involvement and change the urgency of care.

Provocative tests: Specific maneuvers reproduce specific problems. Spurling’s test (neck extension and rotation with gentle downward pressure) is highly specific for cervical radiculopathy. The straight leg raise and slump test are sensitive for lumbar nerve root tension. FABER and other sacroiliac provocation tests, and the Neer and Hawkins tests for shoulder impingement, round out a targeted exam.

Validated questionnaires: The Neck Disability Index (scored 0–50, often reported as a percentage), the Oswestry Disability Index (0–100%), and the 0–10 Numeric Pain Rating Scale turn day-to-day limitations into scores with published thresholds for meaningful change. On the pain scale, a change of about 2 points (or about 30%) is generally considered clinically meaningful.

Lab tests your physician may order and why

TestWhat it checks after an accident
Complete blood count (CBC)Blood loss (anemia), infection, and platelet count before procedures
Comprehensive metabolic panel (CMP)Kidney and liver function, electrolytes, and glucose; kidney function matters before contrast and some medications
Creatine kinase (CK)Muscle breakdown after crush or severe muscle injury (rhabdomyolysis)
ESR and CRPInflammation markers that help rule out infection or inflammatory arthritis as the cause of pain
PT/INR and related coagulation testsBleeding risk in patients on blood thinners before injections
UrinalysisBlood in the urine after blunt abdominal or flank trauma
Pregnancy testSafety screening before radiation-based imaging or procedures when indicated
Findings

What functional testing shows

  • Measurable motion loss

    Range of motion in degrees.

    Shows restriction from muscle guarding, joint injury, or pain, and how it improves with treatment.

  • Focal weakness

    Muscle-by-muscle strength grading.

    A myotomal pattern of weakness supports nerve root involvement and helps decide when MRI or nerve testing is needed.

  • Neurological deficits

    Sensation, reflexes, and upper motor neuron signs.

    Identifies radiculopathy, peripheral nerve injury, or signs of spinal cord involvement that require urgent attention.

  • Functional disability

    Validated NDI and Oswestry scores.

    Quantifies how the injury limits work, sleep, driving, lifting, and self-care, using tools recognized across medicine and by insurers.

  • Hidden medical issues

    Targeted lab work.

    Detects blood loss, muscle breakdown, inflammation, or infection that can masquerade as, or complicate, an accident injury.

  • Progress over time

    Re-testing at follow-up visits.

    Shows objectively whether treatment is working and when you have reached maximum medical improvement.

Head injuries

Screening for traumatic brain injuries and concussion

Concussion is a mild traumatic brain injury and a clinical diagnosis. CT and standard MRI are often normal. The evaluation relies on a structured history and exam: symptom inventories (headache, dizziness, light and noise sensitivity, sleep and mood changes), screening of memory and concentration, and checks of balance, eye movements, and coordination.

Symptoms such as worsening headache, repeated vomiting, confusion, weakness, or a decreasing level of alertness are red flags that need emergency evaluation. For persistent cognitive difficulties, your physician may order MRI and refer for formal neuropsychological testing.

Hurt in a car accident? See a medical doctor. No outside imaging center, no upfront out-of-pocket cost.

Strengths and limits

What Functional & lab tests can and can’t do

Strengths

  • Objective, repeatable numbers instead of impressions
  • Tracks recovery from visit to visit
  • Directs which imaging or nerve tests are actually needed
  • Uses validated tools recognized by physicians and insurers

Limits

  • Pain and guarding can limit effort on strength and motion testing
  • Questionnaires reflect how you feel and are interpreted alongside the exam
  • Lab tests are ordered for specific reasons, not as routine screening
  • Functional testing complements imaging; it doesn’t replace it

What to know before testing

  • Testing stays within what is safe for your injury; tell the examiner if a movement causes sharp or radiating pain.
  • Wear comfortable clothing that lets us see the neck, back, or limb being tested.
  • For lab work, your physician will tell you if fasting is needed.
  • Bring a list of medications, including blood thinners and diabetes medicines.
What to expect

Step by step at Accident Care

  1. 1

    History and questionnaires

    You describe the crash and your symptoms and complete validated scoring tools such as the NDI or Oswestry.

  2. 2

    Measured exam

    Range of motion, strength, sensation, and reflexes are measured and recorded side to side.

  3. 3

    Provocative testing

    Targeted maneuvers check for nerve root tension, joint injury, or impingement.

  4. 4

    Labs if indicated

    Your physician orders blood or urine tests when the clinical picture calls for them.

  5. 5

    Treatment plan

    Findings guide imaging decisions, therapy goals, and medication or injection choices.

  6. 6

    Re-testing

    Measurements are repeated at follow-up visits to document progress.

FAQ

Functional & lab tests after a car accident: common questions

What is functional testing after a car accident?

It is a set of standardized measurements of how your injury affects your body: range of motion in degrees, muscle strength, sensation, reflexes, specific provocative tests, and validated disability questionnaires. It turns your symptoms into objective, trackable findings.

What is the Neck Disability Index?

The Neck Disability Index (NDI) is a validated 10-item questionnaire about how neck pain affects activities such as reading, driving, work, sleep, and concentration. It is scored from 0 to 50 and often reported as a percentage. Higher scores mean greater disability, and repeat scores track recovery.

What is the Oswestry Disability Index?

The Oswestry Disability Index is the most widely used questionnaire for low back pain disability. It covers pain intensity, personal care, lifting, walking, sitting, standing, sleeping, social life, and travel, scored from 0 to 100%.

Why would I need blood work after a car accident?

Not everyone does. Your physician may order labs to check for blood loss, muscle breakdown after a severe muscle injury, inflammation or infection, kidney function before contrast or certain medications, or bleeding risk before an injection.

Why are my measurements repeated at each visit?

Re-testing shows objectively whether treatment is working. Improving range of motion, strength, and disability scores confirm progress; persistent deficits may prompt more imaging, nerve testing, injections, or a specialist referral.

Does insurance cover functional testing and lab work after a car accident?

When another driver caused the accident, their insurance covers medically necessary evaluation and testing. Accident Care bills the insurance directly, so there is zero upfront out-of-pocket cost to you.

What is range of motion testing?

It measures how far a joint or your spine can move, in degrees, using a goniometer or inclinometer. Results are compared with your other side and with typical values, then re-measured to track recovery.

How is grip strength measured?

With a hand dynamometer that records force in kilograms. Both hands are tested, usually several times. Your dominant hand is typically somewhat stronger, so a large difference or a drop over time can indicate injury.

What is the numeric pain rating scale?

It asks you to rate your pain from 0 (no pain) to 10 (worst imaginable). It is simple but validated, and a change of about 2 points, or about 30%, is generally considered clinically meaningful.

Why does the doctor test my reflexes after a car accident?

Reflexes check the circuit between a nerve root, the spinal cord, and a muscle. A reduced reflex can point to a specific pinched nerve root, while brisk reflexes and signs such as a Hoffmann or Babinski sign can indicate spinal cord involvement.

What is Spurling’s test?

Your physician gently extends and rotates your neck toward the painful side and applies light downward pressure. Reproduction of pain radiating into the arm suggests cervical radiculopathy. The test is highly specific, meaning a positive result is a strong clue.

What is a straight leg raise test?

While you lie on your back, your straightened leg is raised. Pain radiating below the knee, usually between about 30 and 70 degrees, suggests tension on a lower lumbar or sacral nerve root, often from a disc herniation.

What is maximum medical improvement (MMI)?

MMI is the point at which your condition has stabilized and further significant improvement is not expected with additional treatment. Objective measurements over time are how physicians document that you have reached it.

Who performs functional testing at Accident Care?

Your Accident Care physicians and our licensed Doctors of Physical Therapy perform and document these measurements at your evaluation and follow-up visits.

References

Sources and further reading

  1. Vernon H, Mior S. The Neck Disability Index: a study of reliability and validity. Journal of Manipulative and Physiological Therapeutics, 1991.
  2. Fairbank JC, Pynsent PB. The Oswestry Disability Index. Spine, 2000.
  3. Rondinelli RD, et al. AMA Guides to the Evaluation of Permanent Impairment. American Medical Association.
  4. Rubinstein SM, et al. A systematic review of the diagnostic accuracy of provocative tests of the neck for diagnosing cervical radiculopathy. European Spine Journal, 2007.
  5. Farrar JT, et al. Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale. Pain, 2001.

This page is educational and doesn’t replace an evaluation by a physician. Last reviewed November 2026. If you have severe headache, confusion, weakness, loss of bladder or bowel control, or chest or abdominal pain after a crash, call 911 or go to the nearest emergency room.

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