How to choose an ASQ interval
ASQ-3 uses age intervals to help select the questionnaire closest to a child's age. The official ASQ-3 product lists intervals from 2 months through 60 months, with coverage for children from 1 to 66 months.
ACChronological Age Calculator
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ASQ Age Calculator
Calculate chronological and prematurity-adjusted age for ASQ planning.
Last updated: June 22, 2026
Calculate ASQ age
Find chronological and prematurity-adjusted age for questionnaire planning.
Guide
How this calculator works
Prematurity adjustment
If a child was born premature, many screening workflows use adjusted age for early childhood screening. Weeks premature can be calculated from 39 weeks minus gestational age at birth, unless your program defines full term differently.
Example input and output
If a child is 10 months old chronologically and was born 6 weeks early, the adjusted age is about 8.5 months. That adjusted age may point to a different questionnaire interval depending on program policy.
Common mistakes
Do not use this page to score or interpret an ASQ questionnaire. Also verify whether your program adjusts for prematurity and what full-term definition it uses.
Best use and limits
Use this calculator to prepare for questionnaire interval selection. Final questionnaire choice and interpretation should follow official ASQ instructions and program policy.
Calculation steps
Step-by-step calculation
Step 1
Input
10 months chronological, 6 weeks premature
Step 2
Rule
ASQ-3 uses age intervals to help select the questionnaire closest to a child's age. The official ASQ-3 product lists intervals from 2 months through 60 months, with coverage for children from 1 to 66 months.
Step 3
Calculation
Chronological age: Calculated from birth date to questionnaire date. Prematurity: Gestational age can adjust the planning age when policy calls for it. Program rules: Questionnaire choice should follow official ASQ guidance and local policy.
Step 4
Result
About 8.5 months adjusted. Adjusted age may affect questionnaire interval selection.
Calculation assumptions
This calculator supports age planning for ASQ workflows. It does not select, score, or interpret questionnaires.
| Assumption | How this page handles it |
|---|---|
| Chronological age | Calculated from birth date to questionnaire date. |
| Prematurity | Gestational age can adjust the planning age when policy calls for it. |
| Program rules | Questionnaire choice should follow official ASQ guidance and local policy. |
Example inputs and outputs
| Input | Output | Why it matters |
|---|---|---|
| 10 months chronological, 6 weeks premature | About 8.5 months adjusted | Adjusted age may affect questionnaire interval selection. |
| 36 months chronological, born at term | 36 months for planning | No prematurity adjustment is usually needed for full-term birth. |
| Near an interval boundary | Confirm questionnaire interval carefully | A small date difference can matter near ASQ interval cutoffs. |
Edge cases
Cases worth checking carefully
Program policy
Some programs define full term or adjustment rules differently, so local policy matters.
Interval boundaries
A few days near an interval boundary can affect which questionnaire is considered closest.
Scoring
This calculator does not score or interpret ASQ results.
When to use and when not to use this calculator
Use it when
Use this calculator to prepare for questionnaire interval selection. Final questionnaire choice and interpretation should follow official ASQ instructions and program policy.
Do not use it when
This tool does not select, score, or interpret an ASQ questionnaire. Follow ASQ guidance and your program's policy.
Frequently asked questions
Does this choose the questionnaire for me?+
It helps with age planning, but final selection should follow official ASQ guidance and program policy.
Why adjust for prematurity?+
Adjusted age can make early developmental comparisons more meaningful for babies born early.
Does this interpret results?+
No. It does not score, diagnose, or interpret questionnaire results.
What if gestational age is unknown?+
Use program guidance. Some workflows may use chronological age when reliable prematurity data is unavailable.
Can this diagnose delay?+
No. It only helps with age calculation and planning context.
Sources and updates
We use these sources to define the age-counting rule, official context, or life-stage assumptions used by this calculator.
Last updated: June 22, 2026
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