目的 建立胎儿左、右肺面积及肺头比的正常参考值范围。方法 对501例正常单胎妊娠12～40周胎儿在标准四腔心切面应用手工描绘法分别描迹左肺、右肺面积,分别除以头围获得左、右肺头比。结果 获得正常妊娠胎儿左、右肺面积及肺头比各孕周参考值范围。胎儿左、右肺面积及肺头比均随孕周的增长而增大。结论 正常妊娠胎儿左、右肺面积及肺头比与孕周呈正相关。不同孕周LHR参考值的建立有利于临床评价膈疝及其他胸腔占位性疾病的预后。

Objective To establish reference intervals for fetal left and right lung areas and lung area to head circumference ratio (LHR). Methods In 501 cases of normal singleton pregnancy between 12 to 40 weeks, the left and right lung areas were measured respectively by ultrasound in the standard four chamber view, using manual tracing of the limits of the lungs. The left and right LHR were calculated when head circumferences were divided by the left and right lung area. Results Normal fetal reference intervals of left and right lung areas and LHR with gestational age were obtained. Fetal left and right lung areas and LHR increased with gestational age. Conclusion Fetal left and right lung areas and LHR values positively correlated with gestational age in normal pregnancy. Normal reference intervals of fetal LHR for every gestational age are valuable for evaluation of prognosis of fetal diaphragmatic hernia and other pulmonary peripheral space-occupying lesions.