孕早期和孕中期的超声孕周评估。

First- and second-trimester ultrasound assessment of gestational age.

作者信息

Kalish Robin B, Thaler Howard T, Chasen Stephen T, Gupta Meruka, Berman Seth J, Rosenwaks Zev, Chervenak Frank A

机构信息

Department of Obstetrics and Gynecology, Weill Medical College of Cornell University, New York, NY 10021, USA.

出版信息

Am J Obstet Gynecol. 2004 Sep;191(3):975-8. doi: 10.1016/j.ajog.2004.06.053.

DOI:10.1016/j.ajog.2004.06.053

PMID:15467575

Abstract

OBJECTIVE

The purpose of this study was to evaluate and compare the accuracy of first- and second-trimester ultrasound assessment of fetal age.

STUDY DESIGN

Differences between ultrasound estimated gestational age and true gestational age were calculated between 11 to 14 weeks of gestation and 18 to 22 weeks of gestation for singleton, twin, and triplet pregnancies that were conceived by in vitro fertilization.

RESULTS

One hundred four singleton pregnancies, 81 twin pregnancies, and 33 triplet pregnancies were included. First trimester ultrasound estimates overestimated gestational age by a mean (+/- SEM) of 1.3 +/- 0.2 days (P < .0001) for singleton pregnancies, 1.4 +/- 0.2 days (P < .0001) for twin pregnancies, and 0.8 +/- 0.4 days (P = .027) for triplet pregnancies. Second trimester estimates were underestimated by a mean of -0.1 +/- 0.4 days (P = .87) for singletons, -0.6 +/- 0.3 days (P = .083) for twins, and -0.6 +/- 0.5 days (p = 0.21) for triplets.

CONCLUSION

Ultrasound assessment of gestational age is very accurate and is marginally better in the first trimester compared with the second.

摘要

目的

本研究的目的是评估和比较孕早期和孕中期超声评估胎儿年龄的准确性。

研究设计

计算体外受精受孕的单胎、双胎和三胎妊娠在妊娠11至14周以及18至22周时超声估计孕周与实际孕周之间的差异。

结果

纳入104例单胎妊娠、81例双胎妊娠和33例三胎妊娠。孕早期超声估计单胎妊娠的孕周平均高估1.3±0.2天（P<.0001），双胎妊娠高估1.4±0.2天（P<.0001），三胎妊娠高估0.8±0.4天（P=.027）。孕中期估计单胎妊娠平均低估-0.1±0.4天（P=.87），双胎妊娠低估-0.6±0.3天（P=.083），三胎妊娠低估-0.6±0.5天（P=0.21）。