The crown rump length can be estimated from the gestational age if there is normal development.
Wiggelsworth
|
menstrual age (end of week) |
crown rump mm |
|---|---|
|
8.5 |
27 |
|
9 |
31 |
|
10 |
40 |
|
11 |
50 |
|
12 |
61 |
|
13 |
74 |
|
14 |
87 |
|
15 |
101 |
|
16 |
116 |
|
17 |
130 |
|
18 |
142 |
|
19 |
153 |
|
20 |
164 |
|
21 |
175 |
|
22 |
186 |
|
23 |
197 |
|
24 |
208 |
|
25 |
218 |
|
26 |
228 |
|
27 |
238 |
|
28 |
247 |
|
29 |
258 |
|
30 |
265 |
|
31 |
274 |
|
32 |
283 |
|
33 |
293 |
|
34 |
302 |
|
35 |
311 |
|
36 |
321 |
|
37 |
331 |
|
38 |
341 |
|
39 |
352 |
|
40 |
362 |
week gestation =
= (-7.4 * (10^(-14)) * (((crown rump length in cm) * 10)^6)) + (9.5 * (10^(-11)) * (((crown rump length in cm) * 10)^5)) + (-5.1 * (10^(-8)) * (((crown rump length in cm) * 10)^4)) + (1.44 * (10^(-5)) * (((crown rump length in cm) * 10)^3)) + (-0.002046 * (((crown rump length in cm) * 10)^2)) + (0.2124544 * ((crown rump length in cm) * 10)) + 3.9969113
Sung and Singer: Liveborn
|
gestational age (weeks) |
crown rump (cm), mean |
crown rump (cm), low |
crown rump (cm), high |
|---|---|---|---|
|
20 |
18.3 |
16.1 |
20.5 |
|
21 |
19.1 |
17.9 |
20.3 |
|
22 |
20 |
18.7 |
21.3 |
|
23 |
20.8 |
18.9 |
22.7 |
|
24 |
21.6 |
20.2 |
23 |
|
25 |
22.5 |
20.9 |
24.1 |
|
26 |
23.3 |
21.4 |
25.2 |
|
27 |
24.2 |
21.7 |
26.7 |
|
28 |
25 |
23.3 |
26.7 |
|
29 |
25.9 |
23.1 |
28.7 |
|
30 |
26.7 |
23.4 |
30 |
|
31 |
27.6 |
23.8 |
31.4 |
|
32 |
28.4 |
18.9 |
37.9 |
|
33 |
29.3 |
26 |
32.6 |
|
34 |
30.1 |
25.8 |
34.4 |
|
35 |
30.9 |
28.9 |
32.9 |
|
36 |
31.8 |
27.9 |
35.7 |
|
37 |
32.6 |
27.6 |
37.6 |
|
38 |
33.5 |
30.3 |
36.7 |
|
39 |
34.3 |
32.4 |
36.2 |
|
40 |
35.2 |
32.4 |
38 |
|
41 |
36 |
32.9 |
39.1 |
|
42 |
36.9 |
34.5 |
39.3 |
week gestation with mean crown rump length =
= (1.1830405 * (crown rump length in cm))-1.610768
week gestation maximum for crown rump length =
= (1.0020557 * (crown rump length in cm)) + 0.4590862
week gestation minimum for crown rump length =
= (1.1996472 * (crown rump length in cm)) + 1.4260879
Sung and Singer: Stillborn
|
gestational age (weeks) |
crown rump (cm), mean |
crown rump (cm), low |
crown rump (cm), high |
|---|---|---|---|
|
20 |
18 |
16 |
20 |
|
21 |
18.9 |
14.1 |
23.7 |
|
22 |
19.8 |
10.2 |
29.4 |
|
23 |
20.6 |
18.3 |
22.9 |
|
24 |
21.5 |
18.4 |
24.6 |
|
25 |
22.3 |
18.3 |
26.3 |
|
26 |
23.2 |
19.1 |
27.3 |
|
27 |
24.1 |
21.2 |
27 |
|
28 |
24.9 |
22.7 |
27.1 |
|
29 |
25.8 |
21.7 |
29.9 |
|
30 |
26.6 |
24.2 |
29 |
|
31 |
27.5 |
24.5 |
30.5 |
|
32 |
28.4 |
25.6 |
31.2 |
|
33 |
29.2 |
25.7 |
32.7 |
|
34 |
30.1 |
26.6 |
33.6 |
|
35 |
30.9 |
27 |
34.8 |
|
36 |
31.8 |
27.8 |
35.8 |
|
37 |
32.7 |
27.6 |
37.8 |
|
38 |
33.5 |
30.9 |
36.1 |
|
39 |
34.4 |
30.7 |
38.1 |
|
40 |
35.2 |
28.8 |
41.6 |
|
41 |
36.1 |
32.4 |
39.8 |
|
42 |
36.9 |
34.9 |
38.9 |
week gestation with mean crown rump length =
= (1.1635879 * (crown rump length in cm)) - 0.993608
week gestation maximum for crown rump length =
= (1.095292 * (crown rump length in cm)) - 3.196922
week gestation minimum for crown rump length =
= (1.0575944 * (crown rump length in cm)) + 5.8614413
Specialty: Obstetrics & Gynecology, Pedatrics
ICD-10: ,
