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考试辅导
超声评定胎儿孕龄与生长发育表
| 孕龄（周） | 双顶径cm | 肱骨长度cm | 腹围cm | 股骨长度cm |
| 12 | 2 | 5.6 | 0.8 | |
| 13 | 2.3 | 6.9 | 1.1 | |
| 14 | 2.7 | 8.1 | 1.5 | |
| 15 | 3 | 9.3 | 1.8 | |
| 16 | 3.3 | 10.5 | 2.1 | |
| 17 | 3.7-3.9 | 2.15 | 12-12.5 | 2.1-2.3 |
| 18 | 4.0-4.3 | 2.41 | 13-13.5 | 2.4-2.7 |
| 19 | 4.4-4.6 | 2.67 | 14-14.5 | 2.8-3.0 |
| 20 | 4.7-4.9 | 2.91 | 15-16 | 3.1-3.3 |
| 21 | 5.0-5.3 | 3.15 | 16.5-17 | 3.4-3.6 |
| 22 | 5.4-5.6 | 3.38 | 17.5-18 | 3.7-3.8 |
| 23 | 5.7-5.9 | 3.61 | 18.5-19 | 3.9-4.1 |
| 24 | 6.0-6.2 | 3.82 | 19.5-20.5 | 4.2-4.4 |
| 25 | 6.3-6.5 | 4.03 | 21-21.5 | 4.5-4.6 |
| 26 | 6.6-6.8 | 4.23 | 22-22.5 | 4.7-4.8 |
| 27 | 6.9-7.1 | 4.42 | 23-23.5 | 4.9-5.0 |
| 28 | 7.2-7.3 | 4.6 | 24-24.5 | 5.1-5.2 |
| 29 | 7.4-7.5 | 4.78 | 25-25.5 | 5.3-5.4 |
| 30 | 7.6-7.8 | 4.94 | 26-26.5 | 5.5-5.6 |
| 31 | 7.9-8.0 | 5.1 | 27-27.5 | 5.7-5.8 |
| 32 | 8.1-8.2 | 5.25 | 28-28.5 | 5.9 |
| 33 | 8.3-8.4 | 5.39 | 29-29.5 | 6.0-6.1 |
| 34 | 8.5-8.6 | 5.53 | 30-30.5 | 6.2-6.3 |
| 35 | 8.7 | 5.65 | 31-31.5 | 6.4-6.6 |
| 36 | 8.8-8.9 | 5.77 | 32-32.5 | 6.7 |
| 37 | 9.0-9.1 | 5.88 | 33-33.5 | 6.8-6.9 |
| 38 | 9.2 | 5.98 | 34-34.5 | 7.0-7.2 |
| 39 | 9.3 | 6.08 | 35-35.5 | 7.3-7.4 |
| 40 | 9.3-9.4 | 6.16 | 36-36.5 | 7.5 |
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