👶 Corrected Age (Prematurity)
Adjust chronological age for prematurity to assess growth and development.
Clinical takeaway
Use corrected age until about 2 years.
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When to use
Developmental assessment of preterm infants.
How it works
Corrected age = chronological age − (40 − gestational age at birth, weeks).
Key points
- Use corrected age until about 2 years.
- Vaccinations follow chronological age.
- Important for interpreting developmental milestones.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Chronological age | 20 weeks |
|---|---|
| Gestational age at birth | 30 weeks |
→Corrected age10weeks
- Weeks preterm：10 (40 − GA)
- ≈ Corrected age：2.3 months
- Note：Use corrected age for developmental assessment, typically until ~2 years.
Frequently asked questions
- What is Corrected Age (Prematurity)?
- Adjust chronological age for prematurity to assess growth and development.
- How is Corrected Age (Prematurity) calculated? What is the core formula?
- Corrected age = chronological age − (40 − gestational age at birth, weeks).
- When is Corrected Age (Prematurity) used?
- Developmental assessment of preterm infants.
- What are the key clinical points for Corrected Age (Prematurity)?
- Use corrected age until about 2 years. Vaccinations follow chronological age. Important for interpreting developmental milestones.
- What are the limits and cautions when using Corrected Age (Prematurity)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Corrected Age (Prematurity) calculated in practice? Can you show a worked example?
- Inputs: Chronological age 20 weeks, Gestational age at birth 30 weeks → Result: Corrected age 10 weeks（Weeks preterm: 10 (40 − GA), ≈ Corrected age: 2.3 months, Note: Use corrected age for developmental assessment, typically until ~2 years.）