8.1 Developmental & Behavioral Screening Tools

Domain II.D of the 2023 CPNP-PC content outline asks you to select and interpret screening and assessment tools. PNCB does not accept a vague "I screen development." The outline names twelve tools. You must know what each measures, who completes it, when Bright Futures or the tool's validated window uses it, and what a positive result does next.

Screening is not diagnosis, and it is not surveillance. Surveillance (Chapter 6) is skilled history and observation at every visit. Screening is a standardized, scored, validated instrument given at recommended ages or whenever surveillance is concerning. A positive screen converts the visit into further assessment, safety planning, Early Intervention, school services, or specialty referral. It does not by itself equal autism, ADHD, major depression, PTSD, or a substance-use disorder. Watching a toddler stack blocks is surveillance, not an Ages & Stages Questionnaire.

The twelve named tools — with typical ages and the next action after a positive result — are the exam inventory. This section unpacks the five developmental and behavioral instruments. Sections 8.2 and 8.3 unpack mental-health, suicide, substance, ACE, SDOH, and disease-specific screens. Learn the whole table; do not skip rows because they appear later.

Bright Futures timing you must not invent

AAP Bright Futures places general developmental screening with a validated tool at 9, 18, and 30 months, and autism-specific screening at 18 and 24 months. Those ages are not "sometime in toddlerhood." Surveillance still happens at every visit. If today's surveillance is already abnormal, give the indicated tool now — do not wait for the next due date.

Correct prematurity for developmental screening age until 24 months chronological age (the same correction idea as growth), then use chronological age. A former 28-week infant at 9 months chronological is not scored on a 9-month ASQ as if born at term.

Ages & Stages Questionnaire (ASQ)

The Ages & Stages Questionnaire (ASQ-3 in current clinics) is a parent-completed, age-interval developmental screen. Separate questionnaires exist for specific age windows from early infancy through about 5½ years. Caregivers rate skills in five domains: communication, gross motor, fine motor, problem solving, and personal-social. Items score as yes / sometimes / not yet.

Compare each domain total to that interval's cutoffs:

• Above cutoff (typical / white): that domain screens typical. Keep surveillance and the next scheduled screen.
• Close to cutoff (monitor / gray): give targeted activities, follow closer, and rescreen. Do not ignore caregiver concern in a gray zone.
• Below cutoff (refer / black): that domain failed. Refer. Hearing evaluation belongs on every language-fail pathway. Early Intervention (IDEA Part C) under age 3, or school-based IDEA Part B at 3 and older, starts in parallel — you do not wait for a psychologist's label.

The ASQ is a screen. It does not diagnose intellectual disability, cerebral palsy, or autism. A motor-domain fail still needs an exam for tone, hips, and neurologic signs. A communication fail is not "he's a boy; he will talk."

Literacy and language matter. Use a validated translation or a trained interpreter sitting with the caregiver and the form. Do not skip items you assume the parent "must have meant yes." Unreturned questionnaires are incomplete screens, not reassurance.

Clinic vignette. A 9-month ASQ shows communication below cutoff: no babbling items endorsed, and the father says she is a quiet baby. Growth is fine. You refer to Early Intervention, arrange hearing assessment, complete the neurologic exam, and you do not book only a 12-month recheck as the plan.

Ages & Stages Questionnaire: Social-Emotional (ASQ:SE)

ASQ:SE (ASQ:SE-2 in many offices) is a separate parent-completed tool for social-emotional behavior — self-regulation, compliance, communication, adaptive functioning, autonomy, affect, and interaction with others. It is not a second copy of the ASQ motor pages.

Scoring direction is a high-yield trap. On ASQ-3, low domain scores are concerning. On ASQ:SE, high scores are concerning (more endorsed problem behaviors). Age-specific cutoffs still decide monitor versus refer. Open-ended caregiver comments are part of the instrument; a parent who writes "he never looks at us" is data.

ASQ:SE does not replace M-CHAT-R/F. A toddler can pass ASQ-3 motor items, fail ASQ:SE, and still need autism-specific screening. Conversely, a positive M-CHAT-R/F is not "just a high ASQ:SE." Use both when each is indicated.

Modified Checklist for Autism in Toddlers, Revised, with Follow-Up (M-CHAT-R/F)

M-CHAT-R/F is the named autism screen. It is parent-completed, 20 yes/no items, validated in roughly the 16–30 month window. Bright Futures times it at 18 and 24 months. A low-risk 18-month result does not cancel the 24-month screen.

It is two-stage:

1. M-CHAT-R total.

   • 0–2: low risk. Continue surveillance; screen again at 24 months if the child is still under 24 months.
   • 3–7: medium risk. You do not refer from the 20-item sheet alone, and you do not watch and wait. Administer the Follow-Up structured interview, which asks only the failed items in more detail.
   • 8–20: high risk. Skip Follow-Up. Refer immediately for autism diagnostic evaluation and Early Intervention.

2. Follow-Up. If two or more items remain failed, the screen is still positive. Refer now for diagnostic evaluation and EI/Part C. Do not tell the family to wait until preschool "to see if he outgrows it."

A positive M-CHAT-R/F is not an autism diagnosis. Diagnosis uses a comprehensive evaluation (developmental-behavioral pediatrics, child psychology/psychiatry, or an autism diagnostic team). You still refer for services without waiting for that appointment. Hearing loss, global delay, and severe social neglect sit on the differential of a toddler who does not respond to name — they do not justify watchful waiting.

Exam traps. Watch-and-wait after a failed Follow-Up. Diagnosing autism in the well-child room from 20 checkboxes. Skipping Follow-Up on a score of 4 because the visit is running late. Medium risk without Follow-Up is an incomplete screen.

Clinic vignette. An 18-month M-CHAT-R scores 5. Follow-Up leaves 3 items failed (no pointing to share, no showing, limited response to name). You refer the same day to Early Intervention and to an autism diagnostic resource, check hearing, and you do not schedule only a 24-month revisit as the intervention.

Pediatric Symptom Checklist (PSC)

The PSC is a broadband psychosocial screen for school-age children (parent PSC; Youth PSC / Y-PSC for adolescents who can self-report). It is not autism-specific and not ADHD-specific. Bright Futures-style behavioral/emotional screening across visits is the use case: internalizing, externalizing, and attention problems on one short parent or youth form.

Versions include the 35-item PSC and the 17-item PSC-17. Cutoffs are version- and age-specific (commonly taught parent PSC-35 totals around the mid-20s for younger children and ≥28 for ages 6–16; PSC-17 often ≥15). Do not treat every research paper's cut as a PNCB trivia item. Do know that a positive PSC means further mental-health assessment, not an automatic stimulant, not a bipolar label, and not "the teacher will handle it."

Use PSC when you need a clinic-wide psychosocial net. Use Vanderbilt when the question has already become ADHD in two settings. Use PHQ or SCARED when the question is depression or anxiety (Section 8.2). Overlapping tools are allowed. Substituting a PSC for a suicide screen is not.

NICHQ Vanderbilt Assessment Scales (any version)

Vanderbilt rating scales (NICHQ) are the named ADHD assessment tools. Any version counts: parent, teacher, and follow-up forms used to monitor treatment.

ADHD, by DSM criteria, requires symptoms and impairment in two or more settings. The exam-ready operationalization is parent AND teacher (or another adult who truly sees the child in a second setting — a weekend grandparent is a weak substitute for school). A parent form with six inattentive items and a teacher form with no symptoms and no academic impairment does not give you two-setting ADHD. A teacher form alone without parent data is equally incomplete.

Scoring principles, not a cutoff-memorization contest:

• Inattention and hyperactivity/impulsivity items map to DSM symptom lists. School-age scoring commonly uses ≥6 of 9 symptoms in a cluster as a positive symptom count (older adolescents may be taught with a ≥5 DSM-5-TR threshold; follow the form version in front of you).
• Performance / impairment items must also be positive. Symptoms without impairment are not a diagnosis.
• Parent forms often include screens for oppositional defiant disorder, conduct problems, and anxiety/depression. Those comorbid screens are clues, not extra diagnoses by themselves.
• Follow-up Vanderbilt tracks whether treatment changed symptoms. That is management (later chapter). This chapter's job is: you cannot "screen ADHD" with only a waiting-room parent checklist.

Vanderbilt does not replace history, exam, hearing/vision, sleep, trauma, learning-disorder, and substance questions. A child who cannot see the board, sleeps five hours, or is hungry is not first a methylphenidate candidate.

Clinic vignette. An 8-year-old's parent Vanderbilt is strongly positive for inattention. You still send the teacher form. The teacher reports no classroom symptoms and average work completion. You do not start a stimulant from the parent form alone; you look for sleep, anxiety, hearing, and home chaos, and you still need two settings before an ADHD diagnosis.

Workflow for the five developmental-behavioral tools

Do not watch and wait on a failed M-CHAT Follow-Up. Do not call informal observation an ASQ. Do not diagnose ADHD from a single setting. That is II.D for developmental and behavioral tools.