Beta Doubling times for Successful* Twins Pregnancies

Beta range Median doubling time (hrs) Fastest doubling time (hrs) Slowest doubling time (hrs) Number of women reporting a doubling time for this day
2 - 4 17.17 9.57 43.62 5
4 - 8 17.33 9.57 43.62 15
8 - 16 21.60 9.57 43.62 38
16 - 32 25.32 9.57 115.65 99
32 - 64 29.89 9.57 115.65 267
64 - 128 34.82 9.57 157.89 673
128 - 256 37.84 11.50 1222.54 1546
256 - 512 39.06 11.50 157.67 2563
512 - 1024 39.72 11.50 178.45 3071
1024 - 2048 40.79 11.50 245.91 2721
2048 - 4096 42.45 11.50 124.22 2105
4096 - 8192 44.59 11.50 329.62 1465
8192 - 16384 49.55 15.66 558.15 1014
16384 - 32768 61.92 15.66 558.15 640
32768 - 65536 78.84 22.81 364.97 330
65536 - 131072 96.71 22.81 599.84 165
131072 - 262144 151.85 25.08 8045.43 34
262144 - 524288 112.92 25.08 112.92 2

* Pregnancies are deemed successful if a heartbeat is detected.
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Show results for pregnancies between and years old