ACOG and SMFM suggest that clinicians use a prediction tool, rather than relying on gestational age
and birth weight estimates alone, when estimating outcomes before a periviable birth.
in almost 75% of cases in which gestational age
exceeded 12 weeks.
was determined by early ultrasound before 24 weeks' gestation, the last normal menstrual period, or transcerebellar diameter.
was calculated from the last menstrual period (LMP) and the first trimester sonography results.
Average gestational age
was 9 weeks[+ or -]3 days in the case group and 10 weeks[+ or -]3 days in the control groups.
Births were classified by gestational age
, and many factors about the mothers were considered in the analysis, including body mass index, race/ethnicity, whether they were first-time mothers, educational attainment, when prenatal care began, source of health insurance, maternal age and maternal height.
Assigning gestational age
-- this is most accurate in the first trimester
Separate linear mixed models with adjustment for potential confounders and a random cohort effect were used to estimate the change in birth weight, head circumference, and gestational age
for 1-interquartile range increase in surrounding greenness.
Preterm birth is defined as a gestational age
less than 37 completed weeks.
The research, presented at the 32nd Annual Society for Maternal-Fetal Medicine Meeting, "The Pregnancy Meeting" showed that small for gestational age
babies delivered early by c-section had higher rates of respiratory distress syndrome than similar preterm babies who were born vaginally.
Women who gave birth to babies large for gestational age
had a larger waist circumference and higher blood glucose levels.
We therefore, conducted a study to establish normal cervical lengths using TVS, between 20 and 34 wk of gestation, for nulliparous women carrying a single foetus of confirmed gestational age