File talk:Fetal length change.jpg

Mean organ weights of an Australian population of fetuses and infants

J Paediatr Child Health. 1990 Apr;26(2):101-3.

Cussen L, Scurry J, Mitropoulos G, McTigue C, Gross J. Source Department of Paediatrics, Monash Medical Centre, Clayton, Victoria, Australia.

Abstract

Charts of organ weights for an Australian population of fetuses and infants are presented. The organ-weight charts were compiled from 1337 stillbirths and liveborn babies whose gestational age ranged from 20 to 43 weeks, and who lived less than 72 h. Macerated stillbirths, multiple births and malformed organs were excluded. Pathological conditions aside from malformations were not excluded, leading to higher standard deviations compared with currently used charts. The organ weights are presented in two-week increments from 20 to 43 weeks' gestation as means, with standard deviations.

PMID: 2361065

Reference values for second trimester fetal and neonatal organ weights and measurements

Pediatr Dev Pathol. 2003 Mar-Apr;6(2):160-7. Epub 2003 Jan 29.

Hansen K, Sung CJ, Huang C, Pinar H, Singer DB, Oyer CE. Source Department of Pathology, Women and Infants Hospital of Rhode Island and Brown Medical School, 101 Dudley Street, Providence, RI 02905, USA.

Abstract

To establish accurate reference ranges for the entire second trimester, we documented organ weights, body weight, and linear measurements for 597 fetuses and neonates with gestational ages ranging from 12 to 26 wk. We determined the mean and standard deviation for weights and measurements at each week of gestation using the StatView trade mark SE + Graphics statistical program. The analyses revealed a linear correlation between the gestational age and, respectively, the toe-heel length, crown-rump length, and crown-heel length. Body and organ weights increase at varying rates throughout the second trimester. The data correlate well with weights and measurements previously published for the latter half of the second trimester, and extend these reference ranges to encompass the entire second trimester.

PMID 12548377

New Length Weight Table

Fetal Development - Length - Weight
Gestational age	Fertilization age	Length	Mass
(LMP) (GA weeks)	(weeks)	(cm)	(g)
8 (embryonic)	6	1.6 (crown to rump)	1
9	7	2.3	2
10	8	3.1	4
11 (fetal)	9	4.1	7
12	10	5.4	14
13 (second trimester)	11	7.4	23
14	12	8.7	43
15	13	10.1	70
16	14	11.6	100
17	15	13	140
18	16	14.2	190
19	17	15.3	240
20	18	16.4 25.6 (crown to heel)	300
21	19	26.7	360
22	20	27.8	430
23	21	28.9	501
24	22	30	600
25	23	34.6	660
26	24	35.6	760
27	25	36.6	875
28 (third trimester)	26	37.6	1005
29	27	38.6	1153
30	28	39.9	1319
31	29	41.1	1502
32	30	42.4	1702
33	31	43.7	1918
34	32	45	2146
35	33	46.2	2383
36	34	47.4	2622
37	35	48.6	2859
38	36	49.8	3083
39	37	50.7	3288
40	38	51.2	3462
41	39	51.7	3597
42	40	51.5	3685
References

References

<pubmed>20121531</pubmed> <pubmed>9315150</pubmed> <pubmed>1732970</pubmed> <pubmed>5781799</pubmed>

Gestational Age

Gestational age (LMP) (weeks)	Length (cm)	Mass (g)
	(crown to rump)
8 weeks	1.6 cm	1 gram
9 weeks	2.3 cm	2 grams
10 weeks	3.1 cm	4 grams
11 weeks	4.1 cm	7 grams
12 weeks	5.4 cm	14 grams
13 weeks	7.4 cm	23 grams
14 weeks	8.7 cm	43 grams
15 weeks	10.1 cm	70 grams
16 weeks	11.6 cm	100 grams
17 weeks	13 cm	140 grams
18 weeks	14.2 cm	190 grams
19 weeks	15.3 cm	240 grams
20 weeks	16.4 cm	300 grams
	(crown to heel)
20 weeks	25.6 cm	300 grams
21 weeks	26.7 cm	360 grams
22 weeks	27.8 cm	430 grams
23 weeks	28.9 cm	501 grams
24 weeks	30 cm	600 grams
25 weeks	34.6 cm	660 grams
26 weeks	35.6 cm	760 grams
27 weeks	36.6 cm	875 grams
28 weeks	37.6 cm	1005 grams
29 weeks	38.6 cm	1153 grams
30 weeks	39.9 cm	1319 grams
31 weeks	41.1 cm	1502 grams
32 weeks	42.4 cm	1702 grams
33 weeks	43.7 cm	1918 grams
34 weeks	45 cm	2146 grams
5.25 pounds	46.2 cm	2383 grams
36 weeks	47.4 cm	2622 grams
37 weeks	48.6 cm	2859 grams
38 weeks	49.8 cm	3083 grams
39 weeks	50.7 cm	3288 grams
40 weeks	51.2 cm	3462 grams
41 weeks	51.7 cm	3597 grams
42 weeks	51.5 cm	3685 grams

Metric and USA

Gestational age (LMP)	Length (US)	Weight (US)	Length (cm)	Mass (g)
	(crown to rump)		(crown to rump)
8 weeks	0.63 inch	0.04 ounce	1.6 cm	1 gram
9 weeks	0.90 inch	0.07 ounce	2.3 cm	2 grams
10 weeks	1.22 inch	0.14 ounce	3.1 cm	4 grams
11 weeks	1.61 inch	0.25 ounce	4.1 cm	7 grams
12 weeks	2.13 inches	0.49 ounce	5.4 cm	14 grams
13 weeks	2.91 inches	0.81 ounce	7.4 cm	23 grams
14 weeks	3.42 inches	1.52 ounce	8.7 cm	43 grams
15 weeks	3.98 inches	2.47 ounces	10.1 cm	70 grams
16 weeks	4.57 inches	3.53 ounces	11.6 cm	100 grams
17 weeks	5.12 inches	4.94 ounces	13 cm	140 grams
18 weeks	5.59 inches	6.70 ounces	14.2 cm	190 grams
19 weeks	6.02 inches	8.47 ounces	15.3 cm	240 grams
20 weeks	6.46 inches	10.58 ounces	16.4 cm	300 grams
	(crown to heel)		(crown to heel)
20 weeks	10.08 inches	10.58 ounces	25.6 cm	300 grams
21 weeks	10.51 inches	12.70 ounces	26.7 cm	360 grams
22 weeks	10.94 inches	15.17 ounces	27.8 cm	430 grams
23 weeks	11.38 inches	1.10 pound	28.9 cm	501 grams
24 weeks	11.81 inches	1.32 pound	30 cm	600 grams
25 weeks	13.62 inches	1.46 pound	34.6 cm	660 grams
26 weeks	14.02 inches	1.68 pound	35.6 cm	760 grams
27 weeks	14.41 inches	1.93 pound	36.6 cm	875 grams
28 weeks	14.80 inches	2.22 pounds	37.6 cm	1005 grams
29 weeks	15.2 inches	2.54 pounds	38.6 cm	1153 grams
30 weeks	15.71 inches	2.91 pounds	39.9 cm	1319 grams
31 weeks	16.18 inches	3.31 pounds	41.1 cm	1502 grams
32 weeks	16.69 inches	3.75 pounds	42.4 cm	1702 grams
33 weeks	17.20 inches	4.23 pounds	43.7 cm	1918 grams
34 weeks	17.72 inches	4.73 pounds	45 cm	2146 grams
35 weeks	18.19 inches	5.25 pounds	46.2 cm	2383 grams
36 weeks	18.66 inches	5.78 pounds	47.4 cm	2622 grams
37 weeks	19.13 inches	6.30 pounds	48.6 cm	2859 grams
38 weeks	19.61 inches	6.80 pounds	49.8 cm	3083 grams
39 weeks	19.96 inches	7.25 pounds	50.7 cm	3288 grams
40 weeks	20.16 inches	7.63 pounds	51.2 cm	3462 grams
41 weeks	20.35 inches	7.93 pounds	51.7 cm	3597 grams
42 weeks	20.28 inches	8.12 pounds	51.5 cm	3685 grams

Predicted Menstrual Age (Weeks) From Crl Measurements (Cm)

CRL	MA
0.2	5.7
2.2	8.9
4.2	11.1
6.2	12.6
8.2	14.2
10.2	16.1
0.3	5.9
2.3	9.0
4.3	11.2
6.3	12.7
8.3	14.2
10.3	16.2
0.4	6.1
2.4	9.1
4.4	11.2
6.4	12.8
8.4	14.3
10.4	16.3
0.5	6.2
2.5	9.2
4.5	11.3
6.5	12.8
8.5	14.4
10.5	16.4
0.6	6.4
2.6	9.4
4.6	11.4
6.6	12.9
8.6	14.5
10.6	16.5
0.7	6.6
2.7	9.5
4.7	11.5
6.7	13.0
8.7	14.6
10.7	16.6
0.8	6.7
2.8	9.6
4.8	11.6
6.8	13.1
8.8	14.7
10.8	16.7
0.9	6.9
2.9	9.7
4.9	11.7
6.9	13.1
8.9	14.8
10.9	16.8
1.0	7.2
3.0	9.9
5.0	11.7
7.0	13.2
9.0	14.9
11.0	16.9
1.1	7.2
3.1	10.0
5.1	11.8
7.1	13.3
9.1	15.0
11.1	17.0
1.2	7.4
3.2	10.1
5.2	11.9
7.2	13.4
9.2	15.1
11.2	17.1
1.3	7.5
3.3	10.2
5.3	12.0
7.3	13.4
9.3	15.2
11.3	17.2
1.4	7.7
3.4	10.3
5.4	12.0
7.4	13.5
9.4	15.3
11.4	17.3
1.5	7.9
3.5	10.4
5.5	12.1
7.5	13.6
9.5	15.3
11.5	17.4
1.6	8.0
3.6	10.5
5.6	12.2
7.6	13.7
9.6	15.4
11.6	17.5
1.7	8.1
3.7	10.6
5.7	12.3
7.7	13.8
9.7	15.5
11.7	17.6
1.8	8.3
3.8	10.7
5.8	12.3
7.8	13.8
9.8	15.6
11.8	17.7
1.9	8.4
3.9	10.8
5.9	12.4
7.9	13.9
9.9	15.7
11.9	17.8
2.0	8.6
4.0	10.9
6.0	12.5
8.0	14.0
10.0	15.9
12.0	17.9
2.1	8.7
4.1	11.0
6.1	12.6
8.1	14.1
10.1	16.0
12.1	18.0

non Sort

CRL	MA
0.2	5.7
0.3	5.9
0.4	6.1
0.5	6.2
0.6	6.4
0.7	6.6
0.8	6.7
0.9	6.9
1.0	7.2
1.1	7.2
1.2	7.4
1.3	7.5
1.4	7.7
1.5	7.9
1.6	8.0
1.7	8.1
1.8	8.3
1.9	8.4
2.0	8.6
2.1	8.7
2.2	8.9
2.3	9.0
2.4	9.1
2.5	9.2
2.6	9.4
2.7	9.5
2.8	9.6
2.9	9.7
3.0	9.9
3.1	10.0
3.2	10.1
3.3	10.2
3.4	10.3
3.5	10.4
3.6	10.5
3.7	10.6
3.8	10.7
3.9	10.8
4.0	10.9
4.1	11.0
4.2	11.1
4.3	11.2
4.4	11.2
4.5	11.3
4.6	11.4
4.7	11.5
4.8	11.6
4.9	11.7
5.0	11.7
5.1	11.8
5.2	11.9
5.3	12.0
5.4	12.0
5.5	12.1
5.6	12.2
5.7	12.3
5.8	12.3
5.9	12.4
6.0	12.5
6.1	12.6
6.2	12.6
6.3	12.7
6.4	12.8
6.5	12.8
6.6	12.9
6.7	13.0
6.8	13.1
6.9	13.1
7.0	13.2
7.1	13.3
7.2	13.4
7.3	13.4
7.4	13.5
7.5	13.6
7.6	13.7
7.7	13.8
7.8	13.8
7.9	13.9
8.0	14.0
8.1	14.1
8.2	14.2
8.3	14.2
8.4	14.3
8.5	14.4
8.6	14.5
8.7	14.6
8.8	14.7
8.9	14.8
9.0	14.9
9.1	15.0
9.2	15.1
9.3	15.2
9.4	15.3
9.5	15.3
9.6	15.4
9.7	15.5
9.8	15.6
9.9	15.7
10.0	15.9
10.1	16.0
10.2	16.1
10.3	16.2
10.4	16.3
10.5	16.4
10.6	16.5
10.7	16.6
10.8	16.7
10.9	16.8
11.0	16.9
11.1	17.0
11.2	17.1
11.3	17.2
11.4	17.3
11.5	17.4
11.6	17.5
11.7	17.6
11.8	17.7
11.9	17.8
12.0	17.9
12.1	18.0

• The 95% confidence interval is + 8% of the predicted age.

Radiology. 1992 Feb;182(2):501-5. Fetal crown-rump length: reevaluation of relation to menstrual age (5-18 weeks) with high-resolution real-time US. Hadlock FP1, Shah YP, Kanon DJ, Lindsey JV. Author information

Abstract Because of recent challenges in the literature regarding the validity of the older crown-rump length (CRL) data developed with conventional static-image ultrasound scanners, the authors evaluated the relationship between CRL and menstrual age of fetuses in a population of 416 patients with good menstrual dates. By using a variety of commercially available transabdominal and transvaginal real-time ultrasound probes, the authors demonstrated that measurements can be made successfully for CRLs varying in size from 2 mm to 12 cm. Regression analysis of the data resulted in development of a new table for predicting menstrual age of fetuses on the basis of CRL measurements obtained between 5 and 18 weeks gestation. Although the magnitude of the raw residuals increased over time, the variability in predicting menstrual age was demonstrated to be relatively constant at +/- 8% (2 standard deviations) when expressed as a percentage of the predicted value. The accuracy in predicting menstrual age from CRL after 14 weeks was equivalent to but not better than conventional measurements such as biparietal diameter and femur length. PMID 1732970