Ashton S S, Russo M P, Simon N V, Shearer D M
J Ultrasound Med. 1983 Mar;2(3):127-9. doi: 10.7863/jum.1983.2.3.127.
Grade III placentas were found in 133 (12 per cent) of 1,082 pregnant women evaluated ultrasonographically after 20 weeks of gestation. Associated biparietal diameter measurements ranged from 7.2 to 10 cm. In 11 women with no complications known to accelerate fetal lung maturity or to induce premature placental maturation, grade III placentas were observed between 30 and 33 weeks of gestation. Gestational ages determined according to the growth adjusted sonographic age method of Sabbagha were accurate within one to three days. Considering the risk of hyaline membrane disease at those gestational ages, a grade III placenta cannot be equated with fetal lung maturity. Criteria other than placental grading should be used to assess the pulmonary status of the fetus.
在1082例妊娠20周后接受超声检查的孕妇中，有133例（12%）发现胎盘为Ⅲ级。相关的双顶径测量值范围为7.2至10厘米。在11例无已知加速胎儿肺成熟或诱导胎盘过早成熟并发症的孕妇中，在妊娠30至33周之间观察到Ⅲ级胎盘。根据萨巴加的生长校正超声孕周法确定的孕周在1至3天内准确。考虑到在这些孕周发生透明膜病的风险，Ⅲ级胎盘不能等同于胎儿肺成熟。应使用胎盘分级以外的标准来评估胎儿的肺部状况。
