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Table 8 Fetal heart rate (male), beats per minute

From: Sex differences in umbilical artery Doppler indices: a longitudinal study

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
  1. 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)