Head Circumference
Chervenak FA, Isaacson GC, and campbell S (eds)
Ultrasound in Obstetrics
and Gynecology 1992;
Table A1-3:pg 1778
Boston: Little, Brown and Company
GA (wks) |
-2SD |
Mean |
+2SD |
12 |
65 |
79 |
93 |
13 |
77 |
92 |
107 |
14 |
94 |
108 |
123 |
15 |
97 |
115 |
134 |
16 |
114 |
125 |
143 |
17 |
124 |
144 |
164 |
18 |
137 |
154 |
172 |
19 |
153 |
167 |
180 |
20 |
167 |
182 |
197 |
21 |
175 |
192 |
209 |
22 |
184 |
202 |
219 |
23 |
196 |
217 |
238 |
24 |
209 |
228 |
247 |
25 |
219 |
235 |
250 |
26 |
232 |
251 |
271 |
27 |
243 |
263 |
283 |
28 |
257 |
275 |
293 |
29 |
269 |
285 |
300 |
30 |
271 |
288 |
305 |
31 |
282 |
301 |
320 |
32 |
285 |
301 |
331 |
33 |
287 |
313 |
338 |
34 |
295 |
317 |
340 |
35 |
303 |
326 |
350 |
36 |
311 |
332 |
354 |
37 |
304 |
337 |
371 |
38 |
307 |
337 |
367 |
39 |
310 |
346 |
383 |
40 |
321 |
354 |
387 |
41 |
332 |
352 |
371 |
42 |
331 |
354 |
378 |