Correlation between Gestational Age, Biparietal Diameter and Fetal Thyroid Estimated by the 2-Dimensional Sonography
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摘要:
目的 利用经腹部二维超声探讨胎儿不同孕周、双顶径与甲状腺大小相关性的研究，建立胎儿甲状腺正常参考范围，用于临床评估胎儿甲状腺功能。 方法 对740名妊娠20～38周的健康孕妇进行测量胎儿甲状腺直径、周长及面积，计算5th、50th、95th百分位数，分析其分别与孕周、双顶径的相关性。 结果 获得20～38周胎儿甲状腺的直径、周长及面积的正常参考范围，发现其第5th、50th、95th百分位数分别随孕龄增加而增大，与孕龄呈高度相关性，相关系数r分别为0.909、0.904、0.913，差异有统计学意义 （P < 0.01）；同时随双顶径增加而增大，与双顶径呈高度相关性，相关系数r分别为0.922、0.914、0.916，差异有统计学意义 （P < 0.01）。 结论 建立不同孕龄和双顶径胎儿甲状腺正常参考范围，不仅有助于监测高风险胎儿甲状腺的大小，及早发现甲状腺功能异常；还可通过监测甲状腺大小来评估甲状腺肿大胎儿宫内治疗的效果。 Abstract:Objective To explore the correlation between different gestational age, biparietal diameter and fetal thyroid size by transabdominal two-dimensional ultrasound, and to provide the normal reference range of fetal thyroid for clinical evaluation of fetal thyroid function. Methods The diameter, circumference and area of the fetal thyroid were measured for 740 healthy pregnant women at 20～38 weeks, the 5th, 50th and 95th percentile was calculated. The correlation between the fetal thyroid with gestational age and biparietal diameter was analyzed respectively. Results The reference range of the diameter, circumference and area of fetal thyroid at 20-38 weeks were obtained. We found the 5th, 50th and 95th percentiles increased with the gestational age, and showed a high correlation with gestational age （r = 0.909, 0.904 and 0.913, respectively）, which was statistically significant （P < 0.01）; And also increased with biparietal diameter, highly correlated with the biparietal diameter （r = 0.922, 0.914 and 0.916, respectively）, which was statistically significant （P < 0.01）. Conclusion In this study, we established the reference range of fetal thyroid according to different gestational ages and biparietal diameter, which is not only helpful to monitor the size of fetal thyroid at high risk for early detection of fetal goiter dysfunction, but also can assess the effect of intrauterine therapy on goiter fetuses by monitoring fetal thyroid size. -
Key words:
- Fetus thyroid /
- Goiter /
- 2-dimensional sonography /
- Prenatal diagnosis
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图 1 孕23周胎儿甲状腺横切面
A：椭圆形回声甲状腺位于两个低回声颈动脉之间，气管位于腺体中间，S表示脊柱，C表示颈动脉，T表示气管；B：胎儿甲状腺横径的测量；C：胎儿甲状腺周长和面积的测量。
Figure 1. A transverse view of the fetal thyroid at 23 weeks’ gestation
图 2 散点图表示740例胎儿甲状腺横径与孕龄的关系（r = 0.909）
Figure 2. Individual scatter plot showing the relationship between the thyroid diameter and gestational age of 740 normal fetuses （r = 0.909）
图 3 散点图表示740例胎儿甲状腺周长与孕龄的关系（r = 0.904）
Figure 3. Individual scatter plot showing the relationship between the thyroid circumference and gestational age of 740 normal fetuses （r = 0.904）
图 4 散点图表示740例胎儿甲状腺面积与孕龄的关系（r = 0.913）
Figure 4. Individual scatter plot showing the relationship between the thyroid area and gestational age of 740 normal fetuses （r = 0.913）
图 5 散点图表示740例胎儿甲状腺横径与双顶径的关系（r = 0.922）
Figure 5. Individual scatter plot showing the relationship between the thyroid diameter and biparietal diameter of 740 normal fetuses （r = 0.922）
图 6 散点图表示740例胎儿甲状腺周长与双顶径的关系（r = 0.914）
Figure 6. Individual scatter plot showing the relationship between the thyroid circumference and biparietal diameter of 740 normal fetuses （r = 0.914）
图 7 散点图表示740例胎儿甲状腺面积与双顶径的关系（r = 0.916）
Figure 7. Individual scatter plot showing the relationship between the thyroid area and biparietal diameter of 740 normal fetuses （r = 0.916）
表 1 20～38周胎儿甲状腺横径、周长和面积的百分位数
Table 1. Percentiles of fetal thyroid diameter，circumference and area during 20-38 weeks’ gestation
孕周（周） n（740） 横径（cm）百分位数 周长（cm）百分位数 面积（cm2）百分位数 5th 50th 95th 5th 50th 95th 5th 50th 95th 20 32 0.87 1.02 1.24 2.65 3.01 3.58 0.55 0.68 1.02 21 32 0.94 1.12 1.27 2.74 3.12 3.76 0.58 0.74 1.11 22 76 1.01 1.15 1.33 2.92 3.23 3.92 0.64 0.80 1.20 23 71 1.06 1.22 1.38 3.01 3.43 4.05 0.68 0.89 1.29 24 58 1.12 1.32 1.49 3.28 3.58 4.16 0.72 1.04 1.39 25 30 1.18 1.38 1.57 3.39 3.78 4.27 0.88 1.12 1.43 26 31 1.22 1.43 1.60 3.48 3.96 4.46 0.92 1.18 1.52 27 36 1.27 1.47 1.67 3.60 4.13 4.65 0.98 1.24 1.60 28 30 1.30 1.52 1.72 3.71 4.25 4.79 1.04 1.31 1.67 29 34 1.33 1.57 1.76 3.82 4.36 4.92 1.09 1.39 1.74 30 30 1.37 1.60 1.81 3.95 4.47 5.01 1.12 1.47 1.82 31 31 1.42 1.65 1.88 4.18 4.59 5.16 1.20 1.55 1.90 32 54 1.48 1.69 1.92 4.27 4.76 5.29 1.27 1.62 1.97 33 31 1.51 1.72 1.96 4.36 4.87 5.45 1.35 1.70 2.04 34 30 1.55 1.79 2.02 4.42 5.04 5.62 1.41 1.77 2.13 35 32 1.58 1.87 2.12 4.50 5.13 5.73 1.48 1.86 2.24 36 34 1.67 1.94 2.19 4.57 5.22 5.88 1.54 1.97 2.40 37 32 1.70 2.01 2.33 4.63 5.30 6.02 1.62 2.07 2.52 38 36 1.74 2.06 2.42 4.72 5.45 6.18 1.68 2.12 2.56 
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表 2 不同双顶径胎儿甲状腺横径、周长和面积的百分位数
Table 2. Percentiles of fetal thyroid diameter, circumference and area according to biparietal diameter
双顶径（cm） 横径（cm）百分位数 周长（cm）百分位数 面积（cm2）百分位数 5th 50th 95th 5th 50th 95th 5th 50th 95th 5.0 0.92 1.10 1.30 2.70 3.03 3.43 0.53 0.69 1.02 5.5 0.98 1.16 1.36 2.82 3.17 3.61 0.59 0.77 1.07 6.0 1.04 1.24 1.45 2.95 3.39 3.79 0.65 0.88 1.14 6.5 1.15 1.34 1.52 3.21 3.60 4.04 0.76 1.03 1.31 7.0 1.24 1.40 1.60 3.34 3.85 4.32 0.87 1.18 1.46 7.5 1.30 1.48 1.69 3.59 4.09 4.60 1.01 1.32 1.64 8.0 1.38 1.57 1.74 3.88 4.31 4.86 1.10 1.47 1.79 8.5 1.47 1.65 1.85 4.08 4.58 5.08 1.19 1.55 1.92 9.0 1.52 1.72 1.94 4.28 4.77 5.28 1.28 1.64 2.07 9.5 1.59 1.80 2.01 4.44 4.98 5.47 1.37 1.86 2.30 10.0 1.64 1.89 2.18 4.58 5.24 5.76 1.46 1.95 2.47
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