B-K Medical Pro Focus 2202, User Manual

Page: 252 / 356

252 Chapter 18
Calculation Tables and Formulas
This section contains the tables and formulas that the system uses for obstetrical and
gynecological calculations. References are listed at the end of the chapter.
Information about the accuracy of the calculations begins on page 275.
Campbell
Campbell:
GA from BPD
Table 18-7. Campbell. Gestational age (GA) calculated from biparietal diameter (BPD)
Campbell:
GA from CRL
Table 18-8. Campbell. Gestational age (GA) calculated from crown-rump length (CRL)
BPD [mm] GA [Days] BPD [mm] GA [Days] BPD [mm] GA [Days]
20 88 50 143 80 215
25 94 55 154 85 232
30 102 60 165 90 253
35 111 65 177 95 280
40 121 70 188
45 132 75 201
CRL [mm] GA [Days] CRL [mm] GA [Days] CRL [mm] GA [Days]
10 49 37 73 64 89
13 52 40 75 67 90
16 55 43 77 70 92
19 58 46 79 73 93
22 61 49 81 76 95
25 63 52 82 79 96
28 66 55 84 82 97
31 69 58 86 85 98
34 71 61 87