Radius Length

Chervenak FA, Isaacson GC, Campbell S (eds)

Ultrasound in Obstetrics and Gynecology 1992;

Table A1-12:pg 1783.

Boston: Little, Brown and Company

GA (wks)	-2SD	Mean	+2SD
12	7	7.8	8.6
13	5.4	9.6	13.8
14	8.2	12	15.8
15	8.3	13.9	19.5
16	13.4	18	22.6
17	15.7	20.7	25.7
18	17.3	22.3	27.3
19	22	26	30
20	23.9	27.7	31.5
21	26	29.6	33.2
22	25.6	31.2	36.8
23	28.9	34.5	40.1
24	31.1	35.7	40.3
25	31.9	36.5	41.1
26	32.6	38.2	43.8
27	35.8	40.6	45.4
28	37.9	41.9	45.9
29	38.7	43.5	48.3
30	38.8	43.8	48.8
31	39.7	46.5	53.3
32	41.4	46.6	51.8
33	41.7	47.5	53.3
34	42.4	48.4	54.4
35	45.4	50.4	55.4
36	45.6	51	56.4
37	47.8	52.8	57.8
38	45.8	52.4	59
39	48.1	54.3	60.5
40	48.6	54.8	61
41	48.2	54.2	60.2
42	51.3	55.9	60.5