Abdominal
Circumference (AC)
Chervenak FA, Isaacson GC
and Campbell S (eds).
Ultrasound in Obstetrics and
Gynecology, 1992;Table A1-5:pg 1779.
|
Gestational Age (wks) |
-2SD |
Mean |
+2SD |
|
12 |
51.7 |
64.1 |
76.5 |
|
13 |
58.9 |
75.3 |
91.7 |
|
14 |
71.6 |
87.8 |
104 |
|
15 |
82.3 |
99.5 |
116.7 |
|
16 |
98.1 |
114.5 |
130.9 |
|
17 |
100.3 |
123.5 |
146.7 |
|
18 |
114.8 |
133.4 |
152 |
|
19 |
134.2 |
147 |
159.8 |
|
20 |
138.5 |
148.5 |
178.5 |
|
21 |
146.9 |
166.9 |
186.9 |
|
22 |
154.3 |
175.7 |
197.1 |
|
23 |
174.9 |
189.9 |
204.9 |
|
24 |
170.5 |
200.9 |
231.3 |
|
25 |
190.5 |
205.7 |
220.9 |
|
26 |
205.5 |
223.1 |
240.7 |
|
27 |
205.1 |
232.5 |
259.9 |
|
28 |
216.1 |
245.7 |
275.3 |
|
29 |
232.9 |
252.3 |
271.7 |
|
30 |
228.5 |
256.1 |
283.7 |
|
31 |
245.1 |
278.1 |
311.1 |
|
32 |
256.3 |
282.9 |
309.5 |
|
33 |
254.1 |
299.1 |
344.1 |
|
34 |
277.4 |
301.6 |
325.8 |
|
35 |
279 |
314.6 |
350.2 |
|
36 |
284.9 |
321.5 |
358.1 |
|
37 |
285.4 |
331.2 |
377 |
|
38 |
301.6 |
336.2 |
370.8 |
|
39 |
295.1 |
350.1 |
405.1 |
|
40 |
327.5 |
365.9 |
404.3 |
|
41 |
320.9 |
362.5 |
404.1 |
|
42 |
329.6 |
361.8 |
394 |