Aorta – Time to Peak Velocity

Rizzo G et.al. Br J Obstet Gynecol 1990;97:603-607

GA (wks)	50th Percentile	5^th Percentile	95th Percentile
20	41.93	28.13	55.73
21	42.26	28.46	56.06
22	42.59	28.79	56.39
23	42.92	29.12	56.72
24	43.25	29.45	57.05
25	43.58	29.78	57.38
26	43.91	30.11	57.71
27	44.24	30.44	58.04
28	44.57	30.77	58.37
29	44.9	31.1	58.7
30	45.23	31.43	59.03
31	45.56	31.76	59.36
32	45.89	32.09	59.69
33	46.22	32.43	60.02
34	46.55	32.75	60.35
35	46.88	33.08	60.68
36	47.21	33.41	61.01
37	47.54	33.74	61.34
38	47.87	34.07	61.67
39	48.2	34.4	62
40	48.53	34.73	62.33