ASQ Calculator
Calculate Ages & Stages Questionnaires (ASQ-3) screening age adjusted for premature birth (<37 weeks) and score Autism Spectrum Quotient (AQ).
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What Is a ASQ Calculator?
The ASQ Calculator calculates the exact assessment age for the Ages & Stages Questionnaires (ASQ-3) child screening tool. It automatically adjusts for premature birth (gestational age under 37 weeks) up to 24 months of age to ensure children receive the developmentally appropriate questionnaire interval.
How to Use This Calculator
- Enter the child’s date of birth and the assessment/screening date.
- If the child was born premature (prior to 37 weeks gestation), enter the gestational weeks at birth.
- View the chronological age, prematurity-adjusted age, and the exact recommended ASQ-3 questionnaire interval.
ASQ-3 Prematurity Age Adjustment Formula
\text{Premature Days} = (40 - \text{Gestational Weeks}) \times 7, \quad \text{Adjusted Age} = \text{Chronological Age} - \text{Premature Days}According to ASQ-3 guidelines, if a child is born before 37 weeks of gestation and is under 2 years of age, chronological age must be adjusted by subtracting the weeks of prematurity from standard 40-week full-term baseline.
Worked Example
Scenario: A child born on March 15 at 34 weeks gestation screened on November 15
Chronological age: 8 months (245 days).
Prematurity delta: (40 - 34) × 7 days = 42 days (approx 1.4 months).
Adjusted age: 8.0 - 1.4 = 6.6 months.
Recommended questionnaire interval: ASQ-3 6-Month Questionnaire.
Tips & Key Notes
- Do not adjust for prematurity if the child was born at 37 weeks gestation or later.
- Discontinue prematurity age adjustment once the child reaches 24 months of chronological age.
- Each ASQ-3 interval has a specific administration window (e.g., the 6-month form covers 5 months 0 days to 6 months 30 days).
Frequently Asked Questions
When should you adjust for prematurity in ASQ-3?
Adjustment for prematurity is required if the child was born before 37 completed weeks of gestation AND the child’s chronological age is under 24 months.
What are the ASQ-3 screening intervals?
The ASQ-3 includes 21 questionnaires covering ages 1 to 66 months: 2, 4, 6, 8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 27, 30, 33, 36, 42, 48, 54, and 60 months.
Why is gestational age adjustment important for developmental screening?
Premature infants have had less time to develop in utero. Evaluating a premature infant against full-term chronological standards would artificially indicate developmental delays that reflect gestational timing rather than neurological delay.
What is the AQ-10 Autism Spectrum Quotient cutoff?
On the adult AQ-10 screening questionnaire, a score of 6 or higher indicates that a comprehensive multidisciplinary autism assessment should be considered, per NICE clinical guideline CG142.
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