Fetal Hemodynamic Parameters in Low Risk Pregnancies: Doppler Velocimetry of Uterine, Umbilical, and Middle Cerebral Artery

Table 3

Percentiles 5, 50, and 95 of SV and PI of uterine, umbilical, and middle cerebral arteries according to gestational age intervals.

GA (weeks)		Uterine arteries			Umbilical artery			Middle cerebral artery
		P5	P50	P95	P5	P50	P95	P5	P50	P95
Systolic velocity (cm/s)
16–19	63	40.25	78.08	151.25	18.36	26.14	36.16	16.24	21.71	30.36
20–23	63	49.25	85.49	142.48	19.11	28.63	41.30	15.19	22.25	29.40
24–27	63	48.98	93.33	139.17	23.30	35.88	48.37	18.53	27.98	36.61
28–31	63	58.64	97.17	147.36	27.27	40.77	49.78	27.01	38.48	53.60
32–35	63	58.40	97.17	181.39	28.23	43.95	57.54	35.30	47.31	66.90
36-37	53	60.02	91.91	141.90	29.11	43.20	64.25	33.89	51.80	72.72
38-39	29	65.57	104.53	162.30	31.51	45.01	60.72	24.20	55.22	72.37
40-41	14	40.25	84.08	140.08	34.60	39.53	63.55	30.36	65.66	92.49
Pulsatility index
16–19	63	0.79	1.09	1.64	1.12	1.38	1.92	1.34	1.66	2.21
20–23	63	0.60	0.90	1.38	1.01	1.25	1.47	1.40	1.71	2.33
24–27	63	0.58	0.85	1.17	0.88	1.08	1.34	1.47	2.01	3.04
28–31	63	0.51	0.72	1.11	0.79	1.03	1.27	1.52	2.12	2.97
32–35	63	0.50	0.72	1.47	0.66	0.91	1.18	1.52	2.12	2.91
36-37	53	0.43	0.67	1.30	0.56	0.84	1.16	0.87	1.75	2.51
38-39	29	0.46	0.67	1.09	0.63	0.79	0.98	1.22	1.72	2.29
40-41	14	0.62	0.78	1.55	0.63	0.78	1.10	1.36	1.68	2.78

GA, gestational age; P, percentile.