Thoracic Circumference

Chitkara U, Rosenberg J, Chervenak FA et.al.

Prenatal sonographic assessment of the fetal thorax:

normal values.

Am J Obstet Gynecol 1987;156:1069-1074

GA (wks)	5th Percentile	50th Percentile	95th Percentile
16	64	91	119
17	73	100	128
18	82	110	137
19	91	119	146
20	100	129	155
21	110	137	164
22	119	146	173
23	128	155	182
24	137	164	191
25	146	173	200
26	155	182	210
27	164	191	219
28	173	200	228
29	182	210	237
30	191	219	246
31	200	228	255
32	209	237	264
33	218	246	273
34	228	255	282
35	237	264	291
36	246	273	300
37	255	282	309
38	264	291	319
39	273	300	328
40	282	309	337