[Clinical study of Osaka formula and improved multiparameter ultrasonic measurement for fetal weight estimation].

Objective: To analyze the factors affecting the accuracy of Osaka formula multiparameter ultrasound-based fetal mass estimation, thereby establishing new formulas to improve the accuracy of the estimation.

Methods: A retrospective review was conducted among 519 healthy women with singleton pregnancy. Three days before the delivery (between 37 and 42 weeks' gestation), ultrasonic measurement of the fetal weight and other indices of the fetus was routinely performed.

[Association between ultrasonographic signs of placental premature aging and pregnancy outcome].

Objective: To explore the association between placental premature aging observed ultrasonographically and the pregnancy outcome.

Method: The perinatal outcome of 30 pregnant women with grade III placenta observed ultrasonographically before 37 weeks of gestation were analyzed retrospectively, with 154 pregnant women with grade III placenta at full term (>37 weeks) selected at random to serve as the control.

Result: The gestational age at delivery (37.