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At 2 years, autism signs are more obvious such as language delay and repetitive play, but onset is earlier. Waiting until 2 years delays diagnosis. Language impairment and behavioral rigidity appear later, not earliest.

At 6 years, autism is well established, but this is far beyond the age of early detection. By this time, deficits in school performance and peer interaction are evident. Cognition and academic difficulties dominate, not early onset.

At 1 to 3 months, infants normally show limited social behaviors, so autism cannot be reliably distinguished. Lack of smiling or eye contact is not diagnostic this early. Developmental immaturity and variability make this age inappropriate for detection.

Smiling responsively at caregivers is a normal developmental milestone by 6 to 8 weeks. Presence of this behavior indicates intact social reciprocity. Its occurrence does not raise concern for autism.

Babbling by 6 months is a normal developmental milestone. Infants with autism often have delayed or absent babbling, but presence of babbling is reassuring. Language progression and phonation are intact here, so no concern.

Reaching for toys is a normal motor milestone by 4 to 6 months. This reflects intact motor coordination and visual-motor integration. Absence would suggest motor delay, not autism-specific social communication deficit.

The Mini-Mental State Examination assesses cognitive function in adults, particularly dementia, not toddlers. It evaluates orientation, memory, and attention, which are inappropriate domains for autism screening in early childhood.

The Glasgow Coma Scale measures consciousness level in acute neurological injury. It evaluates eye, verbal, and motor responses, not social communication. It has no role in autism screening.

The Beck Depression Inventory is a self-report tool for depression severity in adolescents and adults. It assesses mood and affect, not developmental social communication deficits in toddlers.

A single observational assessment is insufficient, as autism requires evaluation across multiple domains. Observation alone cannot capture cognitive and adaptive functioning, leading to incomplete or inaccurate diagnosis.

Laboratory blood testing exclusively cannot diagnose autism. While genetic testing may identify syndromic associations, autism is defined by behavioral and developmental criteria, not laboratory markers.

Neuroimaging is not a diagnostic requirement. Imaging may reveal nonspecific findings but does not confirm autism. Diagnosis relies on clinical evaluation and developmental history, not structural brain imaging.

Diagnosing autism independently is outside the nurse’s scope. Diagnosis requires multidisciplinary input including pediatricians, psychologists, and speech-language pathologists. Independent diagnosis by nurses is inappropriate and beyond professional practice boundaries.

Prescribing pharmacological treatment is not a nursing role. Pharmacologic management of associated symptoms is physician-directed. Nurses focus on screening and referral, not prescribing medications.

Delaying referral until school age misses the critical window for early intervention. Autism signs are evident before age 3. Early screening and referral improve developmental outcomes, while delay worsens prognosis.