Normal fetal renal lengths

Gestational age, weeks	Mean kidney length, cm	95% CI, cm
18	2.2	1.6 - 2.8
19	2.3	1.5 - 3.1
20	2.6	1.8 - 3.4
21	2.7	2.1 - 3.2
22	2.7	2.0 - 3.4
23	3.0	2.2 - 3.7
24	3.1	1.9 - 4.4
25	3.3	2.5 - 4.2
26	3.4	2.4 - 4.4
27	3.5	2.7 - 4.4
28	3.4	2.6 - 4.2
29	3.6	2.3 - 4.8
30	3.8	2.9 - 4.6
31	3.7	2.8 - 4.6
32	4.1	3.1 - 5.1
33	4.0	3.3 - 4.7
34	4.2	3.3 - 5.0
35	4.2	3.2 - 5.2
36	4.2	3.3 - 5.0
37	4.2	3.3 - 5.1
38	4.4	3.2 - 5.6
39	4.2	3.5 - 4.8
40	4.3	3.2 - 5.3
41	4.5	3.9 - 5.1

Fetal_kidney_length.htm

From: Cohen HL, Cooper J, Eisenberg P, et al. Normal length of fetal kidneys: sonographic study in 397 obstetric patients. AJR Am J Roentgenol 1991; 157:545. Reprinted with permission from the American Journal of Roentgenology.

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