Thoracic Length

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)	5^th Percentile	50^th Percentile	95^th Percentile
16	11	20	30
17	13	22	32
18	14	24	34
19	16	27	36
20	18	28	38
21	20	30	40
22	22	32	41
23	24	34	43
24	26	35	45
25	28	37	47
26	29	39	49
27	31	41	51
28	33	43	54
29	35	45	55
30	37	47	56
31	39	49	58
32	41	50	60
33	43	52	62
34	44	54	64
35	46	56	66
36	48	58	68
37	50	60	70
38	52	62	71
39	54	64	73
40	56	65	75