Certified Brain Injury Specialist (CBIS) Exam — 2026/2027 Study Guide
Certified Brain Injury Specialist (CBIS) Exam
2026/2027 Certification Preparation
Comprehensive Study Guide with Answers and Rationales
Instructions
This exam consists of 70 multiple-choice questions distributed across nine sections covering the core domains of
the ACBIS certification examination: brain injury types and mechanisms, pathophysiology, acute assessment and
monitoring, cognitive-behavioral rehabilitation, pharmacological management, behavioral and psychosocial
support, communication and swallowing disorders, community reintegration, and legal/ethical/interprofessional
issues.
• Total Questions: 70 (1 point each)
• Recommended Time: 2 hours
• Passing Score: 80% (56 of 70 correct)
• Select the ONE BEST answer for each question
• Correct answers are highlighted in bold cyan for self-assessment
• Detailed rationales explain clinical reasoning for each answer
References: ACBIS Certification Study Outline, Brain Trauma Foundation Guidelines (4th Ed.), ACRM Evidence-Based Cognitive
Rehabilitation Guidelines, Brain Injury Association of America (BIAA), CDC HEADS UP Initiative, Defense and Veterans Brain
Injury Center (DVBIC)
Section I: Types & Mechanisms of Acquired Brain Injury (Questions 1–8)
1. A 24-year-old male presents to the emergency department after a motorcycle collision. He was not
wearing a helmet and was briefly unconscious at the scene. His initial Glasgow Coma Scale (GCS) score is
14. According to the Brain Trauma Foundation and CDC classification system, this injury is best categorized
as:
A. Severe TBI B. Moderate TBI
C. Mild TBI (concussion) D. Penetrating head injury
Correct Answer: C. Mild TBI (concussion)
Rationale: A GCS score of 13–15 classifies a traumatic brain injury as mild (concussion). The CDC and Brain Trauma
Foundation define mild TBI as GCS 13–15 with or without brief loss of consciousness (<30 minutes). Moderate TBI is
GCS 9–12, and severe TBI is GCS 3–8. Although the mechanism is concerning, the GCS of 14 places this in the mild
category. Penetrating injuries are classified by mechanism, not GCS.
1
, Certified Brain Injury Specialist (CBIS) Exam — 2026/2027 Study Guide
2. A patient involved in a high-speed motor vehicle collision strikes the front of the skull against the
windshield. Imaging reveals contusions at both the site of impact on the frontal pole and at the opposite
temporal pole. This pattern of injury is best described as:
A. Diffuse axonal injury B. Coup-contrecoup injury
C. Epidural hematoma D. Penetrating brain injury
Correct Answer: B. Coup-contrecoup injury
Rationale: Coup-contrecoup injuries occur when the brain strikes the skull at the site of impact (coup) and then
bounces to strike the opposite side of the skull (contrecoup), creating lesions at both locations. This is common in
acceleration-deceleration injuries such as motor vehicle collisions. Diffuse axonal injury (A) is widespread shearing of
axons throughout the brain. Epidural hematoma (C) is bleeding between the skull and dura mater. Penetrating injuries
(D) involve foreign objects breaching the skull.
3. A construction worker sustains a nail gun injury to the left temporal region. The projectile penetrates the
skull and enters the cranial vault. Which type of brain injury mechanism does this represent?
A. Blunt force trauma B. Closed head injury
C. Penetrating brain injury D. Blast injury
Correct Answer: C. Penetrating brain injury
Rationale: Penetrating brain injury occurs when an object breaches the skull and dura mater, entering the cranial
cavity. Nail gun injuries, gunshot wounds, and stab wounds are common mechanisms. These injuries carry high risk of
infection, vascular injury, and direct tissue damage along the projectile trajectory. Blunt force trauma (A) and closed
head injury (B) do not involve skull breach. Blast injuries (D) involve over-pressurization waves.
4. A 62-year-old patient is admitted with new-onset right-sided hemiparesis and aphasia. CT scan reveals an
ischemic infarct in the left middle cerebral artery territory. The brain injury specialist classifies this as which
type of acquired brain injury?
A. Traumatic brain injury B. Anoxic brain injury
C. Stroke (non-traumatic ABI) D. Diffuse axonal injury
Correct Answer: C. Stroke (non-traumatic ABI)
Rationale: Acquired brain injury (ABI) includes all brain injuries occurring after birth that are not hereditary,
congenital, or degenerative. Stroke—both ischemic and hemorrhagic—is a leading cause of non-traumatic ABI. This
patient has an ischemic stroke, which is classified as a non-traumatic ABI. TBI (A) requires an external mechanical
force. Anoxic injury (C) involves oxygen deprivation. DAI (D) is caused by traumatic shearing forces.
5. Which statement correctly distinguishes a concussion from a moderate or severe traumatic brain injury?
A. Concussion always involves visible structural B. Concussion is a functional disturbance
damage on CT imaging. without macroscopic structural damage, while
moderate/severe TBI typically involves
identifiable structural pathology.
C. Concussion always results in prolonged loss of D. Concussion exclusively affects children and
consciousness exceeding 30 minutes. adolescents.
2
, Certified Brain Injury Specialist (CBIS) Exam — 2026/2027 Study Guide
Correct Answer: B. Concussion is a functional disturbance without macroscopic structural damage, while
moderate/severe TBI typically involves identifiable structural pathology.
Rationale: Per the CDC HEADS UP initiative and the Concussion in Sport Group consensus, concussion is a
functional disturbance of brain function rather than a macroscopic structural injury. Standard neuroimaging (CT/MRI)
is typically normal in concussion. Moderate and severe TBI usually demonstrate identifiable structural damage such as
hemorrhage, contusion, or edema on imaging. Concussion may involve no loss of consciousness, and it affects all age
groups.
6. A soldier exposed to an improvised explosive device (IED) blast presents with cognitive difficulties,
headaches, and balance problems despite no penetrating shrapnel wound. This injury mechanism is best
classified as:
A. Penetrating TBI B. Primary blast injury
C. Blunt force TBI D. Hypoxic-ischemic encephalopathy
Correct Answer: B. Primary blast injury
Rationale: Primary blast injury results from the supersonic pressure wave generated by an explosion. This pressure
wave travels through the skull and can cause brain injury without any penetrating fragment or blunt impact. The
Defense and Veterans Brain Injury Center (DVBIC) recognizes primary blast injury as a distinct TBI mechanism.
Symptoms include cognitive deficits, headaches, and vestibular dysfunction. No external wound is necessary for blast-
induced TBI.
7. An 18-year-old football player sustains a head-to-head collision and is diagnosed with a severe diffuse
axonal injury (DAI). Which pathophysiological process best describes the mechanism of DAI?
A. Localized bleeding between the dura and the B. Widespread shearing and stretching of axons
skull due to rapid acceleration-deceleration forces
C. Gradual accumulation of beta-amyloid plaques D. Obstruction of cerebrospinal fluid flow causing
ventricular enlargement
Correct Answer: B. Widespread shearing and stretching of axons due to rapid acceleration-deceleration forces
Rationale: DAI results from rapid acceleration-deceleration or rotational forces that cause widespread shearing,
stretching, and tearing of axons throughout the white matter of the brain. It is one of the most common and devastating
types of TBI, often leading to prolonged coma. The Brain Injury Association of America (BIAA) and ACRM identify DAI
as a primary injury caused by mechanical forces—not bleeding (A), degenerative changes (C), or CSF obstruction (D).
8. Which of the following correctly differentiates primary brain injury from secondary brain injury?
A. Primary injury occurs hours to days after the B. Primary injury is the direct mechanical
initial trauma; secondary injury occurs at the damage at the moment of impact; secondary
moment of impact. injury evolves over hours to days from
physiological processes such as hypoxia,
ischemia, and cerebral edema.
C. Primary injury is always preventable; secondary D. Primary injury only involves the brainstem;
injury is always fatal. secondary injury only involves the cerebral cortex.
Correct Answer: B. Primary injury is the direct mechanical damage at the moment of impact; secondary injury
evolves over hours to days from physiological processes such as hypoxia, ischemia, and cerebral edema.
3
Certified Brain Injury Specialist (CBIS) Exam
2026/2027 Certification Preparation
Comprehensive Study Guide with Answers and Rationales
Instructions
This exam consists of 70 multiple-choice questions distributed across nine sections covering the core domains of
the ACBIS certification examination: brain injury types and mechanisms, pathophysiology, acute assessment and
monitoring, cognitive-behavioral rehabilitation, pharmacological management, behavioral and psychosocial
support, communication and swallowing disorders, community reintegration, and legal/ethical/interprofessional
issues.
• Total Questions: 70 (1 point each)
• Recommended Time: 2 hours
• Passing Score: 80% (56 of 70 correct)
• Select the ONE BEST answer for each question
• Correct answers are highlighted in bold cyan for self-assessment
• Detailed rationales explain clinical reasoning for each answer
References: ACBIS Certification Study Outline, Brain Trauma Foundation Guidelines (4th Ed.), ACRM Evidence-Based Cognitive
Rehabilitation Guidelines, Brain Injury Association of America (BIAA), CDC HEADS UP Initiative, Defense and Veterans Brain
Injury Center (DVBIC)
Section I: Types & Mechanisms of Acquired Brain Injury (Questions 1–8)
1. A 24-year-old male presents to the emergency department after a motorcycle collision. He was not
wearing a helmet and was briefly unconscious at the scene. His initial Glasgow Coma Scale (GCS) score is
14. According to the Brain Trauma Foundation and CDC classification system, this injury is best categorized
as:
A. Severe TBI B. Moderate TBI
C. Mild TBI (concussion) D. Penetrating head injury
Correct Answer: C. Mild TBI (concussion)
Rationale: A GCS score of 13–15 classifies a traumatic brain injury as mild (concussion). The CDC and Brain Trauma
Foundation define mild TBI as GCS 13–15 with or without brief loss of consciousness (<30 minutes). Moderate TBI is
GCS 9–12, and severe TBI is GCS 3–8. Although the mechanism is concerning, the GCS of 14 places this in the mild
category. Penetrating injuries are classified by mechanism, not GCS.
1
, Certified Brain Injury Specialist (CBIS) Exam — 2026/2027 Study Guide
2. A patient involved in a high-speed motor vehicle collision strikes the front of the skull against the
windshield. Imaging reveals contusions at both the site of impact on the frontal pole and at the opposite
temporal pole. This pattern of injury is best described as:
A. Diffuse axonal injury B. Coup-contrecoup injury
C. Epidural hematoma D. Penetrating brain injury
Correct Answer: B. Coup-contrecoup injury
Rationale: Coup-contrecoup injuries occur when the brain strikes the skull at the site of impact (coup) and then
bounces to strike the opposite side of the skull (contrecoup), creating lesions at both locations. This is common in
acceleration-deceleration injuries such as motor vehicle collisions. Diffuse axonal injury (A) is widespread shearing of
axons throughout the brain. Epidural hematoma (C) is bleeding between the skull and dura mater. Penetrating injuries
(D) involve foreign objects breaching the skull.
3. A construction worker sustains a nail gun injury to the left temporal region. The projectile penetrates the
skull and enters the cranial vault. Which type of brain injury mechanism does this represent?
A. Blunt force trauma B. Closed head injury
C. Penetrating brain injury D. Blast injury
Correct Answer: C. Penetrating brain injury
Rationale: Penetrating brain injury occurs when an object breaches the skull and dura mater, entering the cranial
cavity. Nail gun injuries, gunshot wounds, and stab wounds are common mechanisms. These injuries carry high risk of
infection, vascular injury, and direct tissue damage along the projectile trajectory. Blunt force trauma (A) and closed
head injury (B) do not involve skull breach. Blast injuries (D) involve over-pressurization waves.
4. A 62-year-old patient is admitted with new-onset right-sided hemiparesis and aphasia. CT scan reveals an
ischemic infarct in the left middle cerebral artery territory. The brain injury specialist classifies this as which
type of acquired brain injury?
A. Traumatic brain injury B. Anoxic brain injury
C. Stroke (non-traumatic ABI) D. Diffuse axonal injury
Correct Answer: C. Stroke (non-traumatic ABI)
Rationale: Acquired brain injury (ABI) includes all brain injuries occurring after birth that are not hereditary,
congenital, or degenerative. Stroke—both ischemic and hemorrhagic—is a leading cause of non-traumatic ABI. This
patient has an ischemic stroke, which is classified as a non-traumatic ABI. TBI (A) requires an external mechanical
force. Anoxic injury (C) involves oxygen deprivation. DAI (D) is caused by traumatic shearing forces.
5. Which statement correctly distinguishes a concussion from a moderate or severe traumatic brain injury?
A. Concussion always involves visible structural B. Concussion is a functional disturbance
damage on CT imaging. without macroscopic structural damage, while
moderate/severe TBI typically involves
identifiable structural pathology.
C. Concussion always results in prolonged loss of D. Concussion exclusively affects children and
consciousness exceeding 30 minutes. adolescents.
2
, Certified Brain Injury Specialist (CBIS) Exam — 2026/2027 Study Guide
Correct Answer: B. Concussion is a functional disturbance without macroscopic structural damage, while
moderate/severe TBI typically involves identifiable structural pathology.
Rationale: Per the CDC HEADS UP initiative and the Concussion in Sport Group consensus, concussion is a
functional disturbance of brain function rather than a macroscopic structural injury. Standard neuroimaging (CT/MRI)
is typically normal in concussion. Moderate and severe TBI usually demonstrate identifiable structural damage such as
hemorrhage, contusion, or edema on imaging. Concussion may involve no loss of consciousness, and it affects all age
groups.
6. A soldier exposed to an improvised explosive device (IED) blast presents with cognitive difficulties,
headaches, and balance problems despite no penetrating shrapnel wound. This injury mechanism is best
classified as:
A. Penetrating TBI B. Primary blast injury
C. Blunt force TBI D. Hypoxic-ischemic encephalopathy
Correct Answer: B. Primary blast injury
Rationale: Primary blast injury results from the supersonic pressure wave generated by an explosion. This pressure
wave travels through the skull and can cause brain injury without any penetrating fragment or blunt impact. The
Defense and Veterans Brain Injury Center (DVBIC) recognizes primary blast injury as a distinct TBI mechanism.
Symptoms include cognitive deficits, headaches, and vestibular dysfunction. No external wound is necessary for blast-
induced TBI.
7. An 18-year-old football player sustains a head-to-head collision and is diagnosed with a severe diffuse
axonal injury (DAI). Which pathophysiological process best describes the mechanism of DAI?
A. Localized bleeding between the dura and the B. Widespread shearing and stretching of axons
skull due to rapid acceleration-deceleration forces
C. Gradual accumulation of beta-amyloid plaques D. Obstruction of cerebrospinal fluid flow causing
ventricular enlargement
Correct Answer: B. Widespread shearing and stretching of axons due to rapid acceleration-deceleration forces
Rationale: DAI results from rapid acceleration-deceleration or rotational forces that cause widespread shearing,
stretching, and tearing of axons throughout the white matter of the brain. It is one of the most common and devastating
types of TBI, often leading to prolonged coma. The Brain Injury Association of America (BIAA) and ACRM identify DAI
as a primary injury caused by mechanical forces—not bleeding (A), degenerative changes (C), or CSF obstruction (D).
8. Which of the following correctly differentiates primary brain injury from secondary brain injury?
A. Primary injury occurs hours to days after the B. Primary injury is the direct mechanical
initial trauma; secondary injury occurs at the damage at the moment of impact; secondary
moment of impact. injury evolves over hours to days from
physiological processes such as hypoxia,
ischemia, and cerebral edema.
C. Primary injury is always preventable; secondary D. Primary injury only involves the brainstem;
injury is always fatal. secondary injury only involves the cerebral cortex.
Correct Answer: B. Primary injury is the direct mechanical damage at the moment of impact; secondary injury
evolves over hours to days from physiological processes such as hypoxia, ischemia, and cerebral edema.
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