B超单三个神奇作用，你知吗？
图片来源于CFP
B超单的神奇作用之三：判断胎儿是否正常
各孕周相应B超数值对照表：
双顶径BPD——胎儿头部从左到右最长的部分。
头围HC——胎儿环头一周的长度。
腹围AC——胎儿肚子一周的长度。
股骨长FL——胎儿大腿骨的长度。
| 孕周 | BPD | FL | HC | AC |
| 12 | 2.0 | 0.8 | 7.1 | 5.6 |
| 13 | 2.3 | 1.1 | 8.4 | 6.9 |
| 14 | 2.7 | 1.5 | 9.8 | 8.1 |
| 15 | 3.0 | 1.8 | 11.1 | 9.3 |
| 16 | 3.3 | 2.1 | 12.4 | 10.5 |
| 17 | 3.7 | 2.4 | 13.7 | 11.7 |
| 孕周 | BPD | FL | HC | AC |
| 18 | 4.2 | 2.7 | 15.0 | 12.9 |
| 19 | 4.3 | 3.0 | 16.3 | 13.4 |
| 20 | 4.6 | 3.3 | 17.5 | 15.2 |
| 21 | 5.0 | 3.6 | 18.7 | 16.4 |
| 22 | 5.3 | 3.9 | 19.9 | 17.5 |
| 23 | 5.6 | 4.2 | 21.0 | 18.6 |
| 孕周 | BPD | FL | HC | AC |
| 24 | 5.8 | 4.4 | 22.1 | 19.7 |
| 25 | 6.1 | 4.7 | 23.2 | 20.8 |
| 26 | 6.4 | 4.9 | 24.2 | 21.9 |
| 27 | 6.7 | 5.2 | 25.2 | 22.9 |
| 28 | 7.0 | 5.4 | 26.2 | 24.0 |
| 29 | 7.2 | 5.6 | 27.1 | 25.0 |
| 孕周 | BPD | FL | HC | AC |
| 30 | 7.5 | 5.8 | 28.0 | 26.0 |
| 31 | 7.7 | 6.1 | 28.9 | 27.0 |
| 32 | 7.9 | 6.3 | 29.7 | 28.0 |
| 33 | 8.2 | 6.5 | 30.4 | 29.0 |
| 34 | 8.4 | 6.6 | 31.2 | 30.0 |
| 35 | 8.6 | 6.8 | 31.8 | 30.9 |
| 孕周 | BPD | FL | HC | AC |
| 36 | 8.8 | 7.0 | 32.5 | 31.8 |
| 37 | 9.0 | 7.2 | 33.1 | 32.7 |
| 38 | 9.1 | 7.3 | 33.6 | 33.6 |
| 39 | 9.3 | 7.5 | 34.1 | 34.5 |
| 40 | 9.5 | 7.6 | 34.5 | 35.4 |
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