Fetal weights tend to increase with increasing gestational age.
week gestation |
fetal weight low |
mean fetal weight |
fetal weight high |
23 |
419 |
468 |
517 |
24 |
589 |
660 |
731 |
25 |
630 |
666 |
702 |
26 |
680 |
712 |
744 |
27 |
670 |
714 |
758 |
28 |
896 |
951 |
1,006 |
29 |
996 |
1,038 |
1,080 |
30 |
1,161 |
1,219 |
1,277 |
31 |
1,151 |
1,240 |
1,329 |
32 |
1,463 |
1,529 |
1,595 |
33 |
1,554 |
1,603 |
1,652 |
34 |
1,940 |
2,013 |
2,086 |
35 |
2,167 |
2,220 |
2,273 |
36 |
2,439 |
2,489 |
2,540 |
37 |
2,666 |
2,719 |
2,772 |
38 |
2,906 |
2,935 |
2,964 |
39 |
3,118 |
3,140 |
3,162 |
40 |
3,281 |
3,297 |
3,313 |
41 |
3,295 |
3,329 |
3,363 |
42 |
3,417 |
3,463 |
3,509 |
43 |
3,749 |
3,925 |
4,101 |
Initial line approximations:
fetal weight low =
= (3.9592 * ((week gestation)^2)) - (84.6368 * (week gestation)) + 202.2076
fetal weight high =
= (4.365 * ((week gestation)^2)) - 109.8861 * (week gestation) + 686.69
Subsequent line approximations:
Line |
fetal weight = |
low, 23 to 34 weeks |
(8.733 * ((weeks)^2)) - (374.8 * (weeks)) + 4497 |
low, 34 to 43 weeks |
(9.433 * ((weeks)^2)) - (410.6 * (weeks)) + 5050 |
mean, 23 to 34 weeks |
(9.083 * ((weeks)^2)) - (392 * (weeks)) + 4773 |
mean, 34 to 43 weeks |
(-4.439 * ((weeks)^2)) + (536.1 * (weeks)) - 11069 |
high 23 to 34 weeks |
(-8.973 * ((weeks)^2)) + (881.1 * (weeks)) - 17648 |
high, 34 to 43 weeks |
(0.091 * ((weeks)^2)) + (191.3 * (weeks)) - 4493 |
Specialty: Obstetrics & Gynecology, Pedatrics