1. What is Corrected Gestational Age?

Corrected Gestational Age (CGA) is the sum of gestational age at birth and postnatal age. It's used to assess growth and development in preterm infants, accounting for their prematurity when comparing to full-term infants.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( GA_{Birth} \) — Gestational age at birth in weeks
• \( Postnatal\ Weeks \) — Weeks since birth

Explanation: This calculation adjusts the infant's age to account for prematurity, providing a more accurate developmental assessment.

3. Importance of CGA Calculation

Details: CGA is crucial for evaluating growth, neurodevelopment, and determining appropriate developmental milestones in preterm infants. It should be used until at least 2 years of age for extremely preterm infants.

4. Using the Calculator

Tips: Enter gestational age at birth (between 20-45 weeks) and postnatal weeks since birth (up to 52 weeks). Both values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Until what age should CGA be used?
A: Typically until 2-3 years corrected age, though this varies by degree of prematurity and individual development.

Q2: How does CGA differ from chronological age?
A: Chronological age counts from birth, while CGA adjusts for prematurity by adding time since birth to gestational age at birth.

Q3: When should I stop correcting for prematurity?
A: Most clinicians stop correcting after 2-3 years, but this depends on the child's degree of prematurity and developmental progress.

Q4: Does CGA affect vaccination schedules?
A: No, vaccinations should be given based on chronological age, not corrected age.

Q5: How accurate is the gestational age at birth?
A: Early ultrasound dating (first trimester) is most accurate. Later estimates may have ±1-2 week variability.