Page 1 of 108
CDDN (Certified Developmental Disabilities
Nurse) ACTUAL EXAM ALL QUESTIONS AND
CORRECT ANSWERS LATEST UPDATE THIS
YEAR
CDDN – Certified Developmental Disabilities Nurse EXAM
FINAL EXAMINATION
Academic Year: 2026–2027
Certification: Certified Developmental Disabilities Nurse (CDDN)
Content: Questions and Answers Verified with Detailed Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination assesses foundational and applied knowledge in nursing care for patients with
developmental disabilities, including intellectual disability, cerebral palsy, autism spectrum
disorders, communication challenges, behavioral interventions, and medication management.
Each question has one correct answer.
Rationales are based on evidence-based nursing practices, current developmental disability
guidelines, and CDDN standards.
1
, Page 2 of 108
EXAM COVERAGE
• Causes of developmental disabilities
• Behavioral and psychological management
• Autism spectrum disorder interventions
• Cerebral palsy care
• Communication strategies for nonverbal patients
• Individualized Education Programs (IEPs)
• Medication administration considerations
• Aspiration prevention
• Preterm infant risk factors
EXAM QUESTIONS
Question 1
Which of the following is the most common cause of developmental disabilities in children?
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, Page 3 of 108
A) Genetic syndromes
B) Prenatal infections
C) Premature birth
D) Traumatic brain injury
Correct Answer:
A) Genetic syndromes
Rationale:
Genetic syndromes, such as Down syndrome and Fragile X syndrome, are leading causes of
developmental disabilities. Prenatal infections and premature birth contribute but are less
frequent.
Question 2
When caring for a patient with autism spectrum disorder, which strategy is most effective in
reducing anxiety?
A) Providing a highly stimulating environment
B) Using clear, concise instructions and routines
C) Ignoring repetitive behaviors
D) Rapidly changing activities
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, Page 4 of 108
Correct Answer:
B) Using clear, concise instructions and routines
Rationale:
Predictable routines and clear instructions help patients with autism manage anxiety and
reduce stress responses.
Question 3
Which intervention is most appropriate for a patient with intellectual disability who
demonstrates aggressive behavior?
A) Immediate physical restraint
B) Verbal de-escalation and calm communication
C) Ignoring the behavior
D) Punitive measures
Correct Answer:
B) Verbal de-escalation and calm communication
Rationale:
Calm communication and de-escalation are first-line approaches. Physical restraints are only
used if there is immediate danger to the patient or others.
4
CDDN (Certified Developmental Disabilities
Nurse) ACTUAL EXAM ALL QUESTIONS AND
CORRECT ANSWERS LATEST UPDATE THIS
YEAR
CDDN – Certified Developmental Disabilities Nurse EXAM
FINAL EXAMINATION
Academic Year: 2026–2027
Certification: Certified Developmental Disabilities Nurse (CDDN)
Content: Questions and Answers Verified with Detailed Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination assesses foundational and applied knowledge in nursing care for patients with
developmental disabilities, including intellectual disability, cerebral palsy, autism spectrum
disorders, communication challenges, behavioral interventions, and medication management.
Each question has one correct answer.
Rationales are based on evidence-based nursing practices, current developmental disability
guidelines, and CDDN standards.
1
, Page 2 of 108
EXAM COVERAGE
• Causes of developmental disabilities
• Behavioral and psychological management
• Autism spectrum disorder interventions
• Cerebral palsy care
• Communication strategies for nonverbal patients
• Individualized Education Programs (IEPs)
• Medication administration considerations
• Aspiration prevention
• Preterm infant risk factors
EXAM QUESTIONS
Question 1
Which of the following is the most common cause of developmental disabilities in children?
2
, Page 3 of 108
A) Genetic syndromes
B) Prenatal infections
C) Premature birth
D) Traumatic brain injury
Correct Answer:
A) Genetic syndromes
Rationale:
Genetic syndromes, such as Down syndrome and Fragile X syndrome, are leading causes of
developmental disabilities. Prenatal infections and premature birth contribute but are less
frequent.
Question 2
When caring for a patient with autism spectrum disorder, which strategy is most effective in
reducing anxiety?
A) Providing a highly stimulating environment
B) Using clear, concise instructions and routines
C) Ignoring repetitive behaviors
D) Rapidly changing activities
3
, Page 4 of 108
Correct Answer:
B) Using clear, concise instructions and routines
Rationale:
Predictable routines and clear instructions help patients with autism manage anxiety and
reduce stress responses.
Question 3
Which intervention is most appropriate for a patient with intellectual disability who
demonstrates aggressive behavior?
A) Immediate physical restraint
B) Verbal de-escalation and calm communication
C) Ignoring the behavior
D) Punitive measures
Correct Answer:
B) Verbal de-escalation and calm communication
Rationale:
Calm communication and de-escalation are first-line approaches. Physical restraints are only
used if there is immediate danger to the patient or others.
4
