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Table 9 Fetal heart rate (female), 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
20 131 134 137 142 147 153 158 161 164
21 131 133 136 141 146 152 157 160 163
22 130 132 135 140 146 151 156 159 162
23 129 132 134 139 145 151 156 159 161
24 128 131 134 139 144 150 155 158 161
25 127 130 133 138 144 150 155 158 161
26 127 129 132 138 143 149 154 157 160
27 126 129 132 137 143 149 154 157 160
28 125 128 131 136 142 148 154 157 160
29 125 127 131 136 142 148 153 156 159
30 124 127 130 135 141 147 153 156 159
31 124 126 130 135 141 147 153 156 159
32 123 126 129 135 141 147 152 156 159
33 123 125 129 134 140 147 152 156 159
34 122 125 128 134 140 146 152 156 159
35 122 124 128 133 140 146 152 155 158
36 121 124 127 133 139 146 152 155 158
37 121 124 127 133 139 146 152 155 158
38 120 123 127 132 139 145 151 155 158
39 120 123 126 132 139 145 151 155 158
40 120 123 126 132 138 145 151 155 158
  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 (female fetuses)