Frontal Lobe Distance

Goldstein I, Reece EA, Pilu G et.al.

Sonographic assessment of the fetal frontal lobe:

a potential tool for prenatal diagnosis of microcephaly.

Am J Obstet Gynecol 1988;158:1057-1062

GA (wks)	-2SD	Mean	+2SD
15	6	14	22
16	6	14	22
17	12	16	20
18	12	16	21
19	13	17	21
20	13	17	21
21	10	18	26
22	10	18	26
23	10	18	26
24	15	19	23
25	14	22	30
26	15	23	31
27	13	25	37
28	24	28	32
29	23	27	31
30	16	28	40
31	21	29	37
32	18	30	42
33	19	31	43
34	28	32	36
35	24	32	40
36	24	32	40
37	26	34	42
38	27	35	43
39	25	37	49
40	28	40	52