Table 8.

Fetal heart rate (male), beats per minute

Gestation (week)	2.5th percentile	5th percentile	10th percentile	25th percentile	Mean	75th percentile	90th percentile	95th percentile	97.5th percentile
20	129	132	135	141	147	153	159	162	165
21	128	131	134	140	146	152	157	161	164
22	127	130	133	139	145	151	156	160	163
23	127	129	133	138	144	150	156	159	162
24	126	129	132	137	143	149	155	158	161
25	125	128	131	136	142	149	154	158	160
26	124	127	130	136	142	148	154	157	160
27	123	126	130	135	141	147	153	156	159
28	123	126	129	134	141	147	153	156	159
29	122	125	128	134	140	146	152	156	159
30	121	124	128	133	140	146	152	155	158
31	121	124	127	133	139	146	152	155	158
32	120	123	127	132	139	145	151	155	158
33	120	123	126	132	138	145	151	155	158
34	119	122	125	131	138	145	151	154	158
35	118	121	125	131	138	144	151	154	157
36	118	121	125	131	137	144	150	154	157
37	117	120	124	130	137	144	150	154	157
38	117	120	124	130	137	144	150	154	157
39	116	120	123	129	136	143	150	154	157
40	116	119	123	129	136	143	150	154	157

Sex-specific reference values of the fetal heart rate (HR) for the 2.5th, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97.5th percentiles during the second half of pregnancy (male fetuses)