Table 5.

Percentiles of fetal superior vena cava volume blood flow normalized by head circumference (ml/min/cm) at 20–40 weeks of gestational age (GA).

		Percentile
GA (weeks)	n	2.5th	5th	10th	50th	90th	95th	97.5th
20	20	0.39	0.44	0.51	0.87	1.49	1.74	1.98
21	32	0.44	0.50	0.58	1.00	1.70	1.97	2.25
22	29	0.50	0.57	0.66	1.13	1.92	2.23	2.54
23	32	0.57	0.65	0.75	1.28	2.16	2.51	2.86
24	17	0.64	0.73	0.85	1.44	2.43	2.82	3.21
25	28	0.73	0.82	0.96	1.61	2.72	3.15	3.58
26	28	0.81	0.92	1.07	1.80	3.03	3.51	3.99
27	26	0.91	1.03	1.20	2.01	3.36	3.89	4.42
28	27	1.01	1.15	1.33	2.23	3.72	4.30	4.88
29	21	1.12	1.28	1.47	2.46	4.10	4.74	5.38
30	34	1.24	1.41	1.63	2.71	4.50	5.20	5.89
31	25	1.37	1.55	1.79	2.97	4.93	5.69	6.44
32	17	1.50	1.70	1.96	3.24	5.37	6.19	7.01
33	24	1.64	1.86	2.14	3.53	5.83	6.72	7.60
34	25	1.79	2.02	2.33	3.83	6.30	7.26	8.20
35	24	1.94	2.19	2.52	4.14	6.79	7.81	8.83
36	17	2.10	2.36	2.72	4.45	7.29	8.38	9.46
37	18	2.26	2.54	2.92	4.77	7.80	8.96	10.10
38	22	2.42	2.73	3.13	5.10	8.31	9.53	10.75
39	17	2.58	2.91	3.34	5.43	8.81	10.11	11.39
40	2	2.75	3.10	3.55	5.75	9.32	10.68	12.03