1. What is Corrected Gestational Age?

Corrected Gestational Age (CGA) is a calculation that adjusts chronological age to account for prematurity. It's particularly important for assessing development in preterm infants during the first years of life.

2. How Does the Calculator Work?

The calculator uses the CGA formula:

Where:

• \( \text{Chronological Age} \) — Current age in weeks since birth
• \( \text{Gestational Age at Birth} \) — Weeks of gestation at time of birth

Explanation: The equation accounts for the weeks of prematurity by subtracting the difference from full term (40 weeks) from the chronological age.

3. Importance of CGA Calculation

Details: Corrected age is crucial for accurate developmental assessment of preterm infants, as it allows comparison with full-term infant milestones. It's typically used until 2-3 years of age.

4. Using the Calculator

Tips: Enter chronological age in weeks (since birth) and gestational age at birth in weeks. Both values must be positive numbers (gestational age typically ≤40 weeks).

5. Frequently Asked Questions (FAQ)

Q1: Until what age should corrected age be used?
A: Most experts recommend using corrected age until 2-3 years for developmental assessments, though this may vary by individual circumstances.

Q2: How does this differ from postmenstrual age?
A: Postmenstrual age is gestational age at birth plus chronological age, while corrected age adjusts chronological age for prematurity.

Q3: Should corrected age be used for growth charts?
A: Yes, growth parameters should be plotted according to corrected age for preterm infants, especially in the first year.

Q4: How to calculate for age in months?
A: First calculate in weeks, then convert to months by dividing by 4.345 (average weeks per month).

Q5: Does this apply to all preterm infants?
A: The correction is most important for infants born before 37 weeks, with greater significance for those born more prematurely.