100+ Free CDDN Practice Questions

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Which nutrition assessment finding in an individual with cerebral palsy indicates the need for alternative nutrition support (e.g., gastrostomy tube feeding)?

The individual occasionally spills food during meals

The individual prefers certain food textures

The individual eats slowly but maintains adequate nutrition

Severe malnutrition, recurrent aspiration pneumonia, and mealtimes exceeding 30 minutes despite optimal positioning and diet modification

to track

2026 Statistics

Key Facts: CDDN Exam

30%

Health Assessment Weight

Largest domain

~$300

Exam Fee

DDNA

5 yrs

Certification Validity

DDNA

50-70 hrs

Study Time

Recommended

Content Domains

DDNA

License Required

Active unrestricted

The CDDN (Certified Developmental Disabilities Nurse) exam is administered by DDNA and covers multiple-choice questions in a computer-based format. The exam tests six content domains: Health Assessment/Management (30%), Behavior Support/Mental Health (20%), Legal/Ethical/Advocacy (15%), Health Promotion (15%), Care Coordination (10%), and Professional Development (10%). Key topics include seizure management, psychotropic medication monitoring, person-centered planning, and genetic syndromes such as Down syndrome and autism spectrum disorder.

Sample CDDN Practice Questions

Try these sample questions to test your CDDN exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which federal law mandates that individuals with developmental disabilities receive services in the least restrictive environment?

A.HIPAA

B.Americans with Disabilities Act (ADA)

C.Individuals with Disabilities Education Act (IDEA)

D.Olmstead v. L.C. Supreme Court decision

Explanation: The Olmstead v. L.C. (1999) Supreme Court decision ruled that unjustified institutional isolation of people with disabilities is discrimination under the ADA, mandating that states provide community-based services in the least restrictive environment. While the ADA broadly prohibits disability discrimination, Olmstead specifically established the integration mandate for services. This landmark ruling transformed developmental disabilities nursing toward community-based, person-centered care models.

2A nurse is developing a care plan for a 25-year-old patient with intellectual disability. Which approach BEST reflects current best practice?

A.The nurse independently creates a care plan based on medical diagnoses only

B.The nurse develops a person-centered plan with the individual, their support network, and interdisciplinary team

C.The plan focuses solely on deficits and limitations

D.The nurse creates a plan identical to all other patients with intellectual disability

Explanation: Person-centered planning is the gold standard for care of individuals with developmental disabilities. It involves the individual as the primary decision-maker, incorporates their preferences, strengths, goals, and dreams, and includes their chosen support network and interdisciplinary team. This approach respects autonomy, promotes self-determination, and recognizes that each individual has unique needs and abilities. Deficit-based or one-size-fits-all approaches are contrary to evidence-based practice.

3Which condition is the MOST common genetic cause of intellectual disability?

A.Fragile X syndrome

B.Down syndrome (trisomy 21)

C.Prader-Willi syndrome

D.Williams syndrome

Explanation: Down syndrome (trisomy 21) is the most common genetic cause of intellectual disability, occurring in approximately 1 in 700 live births. It results from an extra copy of chromosome 21 and is associated with characteristic physical features, intellectual disability ranging from mild to moderate, and increased risk of congenital heart defects, thyroid dysfunction, leukemia, and early-onset Alzheimer disease. Fragile X syndrome is the most common inherited cause of intellectual disability but is less common overall.

4A patient with autism spectrum disorder becomes severely agitated during a routine blood draw. Which nursing intervention should be attempted FIRST?

A.Physically restrain the patient immediately

B.Use environmental modifications such as reducing stimulation, providing visual schedules, and allowing extra time

C.Postpone the blood draw indefinitely

D.Administer PRN sedation as the first intervention

Explanation: Environmental modifications and proactive support should be attempted first for individuals with autism spectrum disorder who become agitated during medical procedures. Strategies include reducing sensory stimulation (dimming lights, reducing noise), providing visual schedules or social stories to prepare the patient, allowing extra time, using preferred communication methods, and offering comfort items. Physical restraint and sedation should be last-resort interventions after less restrictive measures have been exhausted.

5What is the PRIMARY purpose of functional behavior assessment (FBA) in developmental disabilities nursing?

A.To diagnose a psychiatric disorder

B.To identify the function (purpose) of a challenging behavior and develop positive support strategies

C.To determine the patient's IQ score

D.To justify the use of restrictive interventions

Explanation: Functional behavior assessment (FBA) is conducted to identify the function or purpose of a challenging behavior — specifically, what the individual gains (positive reinforcement like attention or access to preferred items) or avoids (negative reinforcement like escaping demands or unpleasant stimuli) through the behavior. Understanding the function guides development of positive behavioral support plans that teach replacement behaviors. FBA is not a diagnostic tool and should never be used to justify restrictive practices.

6Which type of seizure is MOST commonly seen in individuals with Lennox-Gastaut syndrome, a condition frequently co-occurring with intellectual disability?

A.Absence seizures only

B.Multiple seizure types including tonic, atonic, and atypical absence

C.Simple partial seizures only

D.Febrile seizures

Explanation: Lennox-Gastaut syndrome is a severe epilepsy syndrome that typically presents in childhood and is characterized by multiple seizure types including tonic (stiffening), atonic (drop attacks), and atypical absence seizures. It frequently co-occurs with intellectual disability and is often medication-resistant. The syndrome accounts for 1-4% of childhood epilepsies but a disproportionate share of refractory cases. Management often requires multiple antiepileptic medications, and seizure safety protocols are essential in care planning.

7What is the nurse's PRIMARY responsibility regarding guardianship and consent for a patient with intellectual disability?

A.Assume the patient cannot make any decisions

B.Verify legal guardianship status and scope, support the individual's decision-making to the maximum extent possible, and obtain consent from the appropriate party

C.Always seek consent from family members regardless of guardianship status

D.Guardianship status does not affect nursing care

Explanation: The nurse must verify the legal guardianship status and its specific scope (full, limited, or no guardianship) before seeking consent. Many individuals with intellectual disabilities retain decision-making capacity for some or all areas of their lives. The nurse should support the individual's participation in decision-making to the maximum extent possible, using supported decision-making approaches when available. Consent must be obtained from the legally authorized representative when guardianship applies, but the individual's preferences should always be considered.

8A nurse caring for an adult with cerebral palsy notes progressive difficulty swallowing, frequent coughing during meals, and recurrent aspiration pneumonia. Which assessment is MOST appropriate?

A.Administer a bolus feeding immediately

B.Refer for a modified barium swallow study (videofluoroscopic swallowing evaluation)

C.Switch to a liquid-only diet without assessment

D.No assessment is needed; this is expected in cerebral palsy

Explanation: Progressive dysphagia with aspiration risk in an individual with cerebral palsy warrants a modified barium swallow study (videofluoroscopic swallowing evaluation) to objectively assess swallowing mechanics, identify the phase of swallowing impairment, and determine safe food and liquid consistencies. Dysphagia affects 40-90% of adults with cerebral palsy and is a leading cause of morbidity. Empiric diet changes without assessment may be inappropriate, and aspiration pneumonia should never be accepted as inevitable.

9Which medication class requires the MOST vigilant monitoring in individuals with intellectual disabilities due to significant metabolic side effects?

A.Acetaminophen

B.Atypical antipsychotics (second-generation antipsychotics)

C.Proton pump inhibitors

D.Multivitamins

Explanation: Atypical antipsychotics (risperidone, olanzapine, quetiapine, aripiprazole) require vigilant monitoring in individuals with developmental disabilities due to significant metabolic side effects including weight gain, hyperlipidemia, hyperglycemia/diabetes, metabolic syndrome, and tardive dyskinesia. These medications are frequently prescribed for behavioral management in this population. Monitoring should include fasting glucose, lipid panel, weight/BMI, waist circumference, and assessment for extrapyramidal symptoms at regular intervals per APA/ADA guidelines.

10What is 'diagnostic overshadowing' in the context of developmental disabilities nursing?

A.Using advanced diagnostic imaging technology

B.Attributing symptoms of a medical or psychiatric condition to the developmental disability itself, leading to missed diagnoses

C.Providing extra diagnostic tests for safety

D.Consulting multiple specialists for a single diagnosis

Explanation: Diagnostic overshadowing occurs when healthcare providers attribute symptoms of a physical or psychiatric condition to the person's developmental disability, resulting in missed diagnoses and delayed treatment. For example, pain behaviors may be attributed to 'behavior problems' rather than investigated for underlying medical causes (dental pain, constipation, GERD, UTI). This phenomenon is a well-documented cause of health disparities in people with developmental disabilities. DD nurses play a critical role in advocating for thorough medical evaluations.

About the CDDN Exam

The CDDN certification demonstrates your specialized knowledge in developmental disabilities nursing, including health assessment, behavioral support, person-centered planning, legal/ethical advocacy, and care coordination for individuals with intellectual and developmental disabilities.

Questions

150 scored questions

Time Limit

3 hours

Passing Score

Criterion-referenced pass/fail

Exam Fee

~$300 (DDNA)

CDDN Exam Content Outline

30%

Health Assessment/Management

Physical assessment adaptations, medication management, seizure care, dysphagia, chronic conditions

20%

Behavior Support/Mental Health

Functional behavior assessment, positive behavioral support, psychotropic monitoring, de-escalation

15%

Legal/Ethical/Advocacy

Guardianship, consent, abuse recognition, patient rights, ADA, self-determination

15%

Health Promotion/Disease Prevention

Preventive screenings, nutrition, exercise safety, dental health, immunization

10%

Care Coordination/Communication

Person-centered planning, transition services, communication strategies, family support

10%

Professional Development

Evidence-based practice, documentation standards, staff education, quality improvement

How to Pass the CDDN Exam

What You Need to Know

Passing score: Criterion-referenced pass/fail
Exam length: 150 questions
Time limit: 3 hours
Exam fee: ~$300

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CDDN Study Tips from Top Performers

1Focus on Health Assessment/Management (30% of the exam) — know condition-specific health monitoring for Down syndrome, cerebral palsy, and autism

2Master behavioral concepts: functional behavior assessment, the four functions of behavior, and positive behavioral support planning

3Study psychotropic medication monitoring including metabolic side effects of atypical antipsychotics and the STOMP initiative

4Know legal concepts: guardianship vs. supported decision-making, Olmstead decision, ADA Title III, mandated reporting

5Use our AI tutor to work through complex clinical scenarios involving dual diagnosis and diagnostic overshadowing

Frequently Asked Questions

What is the CDDN certification?

The CDDN (Certified Developmental Disabilities Nurse) is a specialty nursing certification administered by the Developmental Disabilities Nurses Association (DDNA). It validates expertise in caring for individuals with intellectual and developmental disabilities across the lifespan, covering health assessment, behavioral support, advocacy, and person-centered care.

What topics are on the CDDN exam?

The CDDN exam covers six content domains: Health Assessment/Management (30%) including seizures, dysphagia, and medication monitoring; Behavior Support/Mental Health (20%) including FBA and PBS; Legal/Ethical/Advocacy (15%); Health Promotion (15%); Care Coordination (10%); and Professional Development (10%). Genetic syndromes like Down syndrome, autism, and cerebral palsy are heavily represented.

How do I become eligible for the CDDN exam?

CDDN eligibility requires an active, unrestricted RN license and clinical experience in developmental disabilities nursing. The exam fee is approximately $300 and the certification is valid for 5 years. Check DDNA's website for specific hour and experience requirements.

How long should I study for the CDDN exam?

Plan for 50-70 hours of study over 5-8 weeks. Prioritize Health Assessment/Management (30% of the exam), then Behavior Support/Mental Health (20%). Complete at least 100 practice questions and score consistently above 80% on practice tests before taking the exam.

What conditions should I know for the CDDN exam?

Key conditions include Down syndrome (cardiac, thyroid, AAI, early Alzheimer's), autism spectrum disorder (sensory processing, communication), cerebral palsy (spasticity, dysphagia, scoliosis), Prader-Willi syndrome (hyperphagia), Fragile X syndrome, Angelman syndrome, Rett syndrome, and fetal alcohol spectrum disorders. Know the unique health needs and nursing considerations for each.