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

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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