B超数据标准：
| 参考项目 | 正常值 | 风险 |
|---|---|---|
| 胎心 | 120-160次 | 胎停育 |
| 羊水深度 | 3-7cm | 羊水过多 羊水过少 |
孕期正常参数值：
| 孕周 | 双顶径（平均值）cm | 腹围（平均值）cm | 股骨长（平均值）cm |
|---|---|---|---|
| 13周 | 2.52士0.25 | 6.90士1.65 | 1.17士0.31 |
| 14周 | 2.83士0.57 | 7.77士1.82 | 1.38士0.48 |
| 15周 | 3.23士0.51 | 9.13士1.56 | 1.74士0.58 |
| 16周 | 3.62士0.58 | 10.32士1.92 | 2.10士0.51 |
| 17周 | 3.97士0.44 | 11.49士1.62 | 2.52士0.44 |
| 18周 | 4.25士0.53 | 12.41士l.89 | 2.71士0.46 |
| 19周 | 4.52士0.53 | 13.59士2.30 | 3.03士0.50 |
| 20周 | 4.88士0.58 | 14.80士l.89 | 3.35士O.47 |
| 21周 | 5.22士0.42 | 15.62士l.84 | 3.64士O.40 |
| 22周 | 5.45士0.57 | 16.70士2.23 | 3.82士0.47 |
| 23周 | 5.80士0.44 | 17.90士1.85 | 4.21士0.41 |
| 24周 | 6.05士0.50 | 18.74士2.23 | 4.36士0.51 |
| 25周 | 6.39士0.70 | 19.64士2.20 | 4.65士0.42 |
| 26周 | 6.68士0.61 | 21.62士2.30 | 4.87士O.41 |
| 27周 | 6.98士0.57 | 21.81士2.12 | 5.10士O.41 |
| 28周 | 7.24士O.65 | 22.86士2.41 | 5.35士0.55 |
| 29周 | 7.50士O.65 | 23.71士1.50 | 5.61士0.44 |
| 30周 | 7.83士0.62 | 24.88士2.03 | 5.77士0.47 |
| 31周 | 8.06士0.60 | 25.78士2.32 | 6.03士0.38 |
| 32周 | 8.17士0.65 | 26.20士2.33 | 6.43士0.49 |
| 33周 | 8.50士0.47 | 27.78士2.30 | 6.52士0.46 |
| 34周 | 8.61士0.63 | 27.99士2.55 | 6.62士0.43 |
| 35周 | 8.70士0.55 | 27.74士2.83 | 6.95士0.47 |
| 36周 | 8.81士0.57 | 29.44士2.83 | 6.95士0.47 |
| 37周 | 9.00士0.63 | 30.14士2.17 | 7.10士0.52 |
| 38周 | 9.08士0.59 | 30.63士2.83 | 7.20士0.43 |
| 39周 | 9.21士0.59 | 31.34士3.12 | 7.34士0.53 |
| 40周 | 9.28士0.50 | 31.49士2.79 | 7.40士0.53 |
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