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15

 

MICROCEPHALY

 

Microcephaly in the neonatal period is defined as a head circumference that is less than the second standard deviation below the mean for gestational age (Table 269.1). Race and sex should be considered before making the diagnosis of microcephaly.

Table 269.1 Microcephaly: lower limits of normal head circumference for gestational age.

Gestational Age / weeks
Head Circumference / cm
28
30
32
34
36
38
40
42
44
46
23
25
27
29
30
31
32
33
34
35

 

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Babson, 1976 Martin, 1970