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  • GAIA Level 3a Postnatally Diagnosed Congenital Microcephaly is defined by three criteria: first, a live birth, stillbirth, or spontaneous or therapeutic abortion of at least 24 weeks GA based on LMP without confirmatory 1st or 2nd trimester ultrasound; second, a head circumference (HC) measurement either 2 standard deviations (SD) below the mean or less than the third percentile as assessed by GA and gender, using appropriate, standardized reference charts for the population (e.g. WHO growth reference charts if GA greater than or equal to 37 weeks and Intergrowth-21st reference charts for GA 24 to 36 weeks); third, the measurement is taken up to 6 weeks after birth or end of pregnancy, with no apparent post-natal insult resulting in microcephaly.
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