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Large for gestational age (LGA) is generally used to describe a birth weight equal to or greater than the 90th percentile for a given gestational age .
However, there is not universal agreement on these definitions , and some have proposed the 15th and 97th percentiles as more optimal cut-offs to define SGA and LGA respectively .
Very small and very large babies have higher mortality and morbidity rates than infants of normal size . al., Evaluating the thresholds of abnormal second trimester multiple marker screening tests associated with intra-uterine growth restriction.
BACK TO TOP OF PAGE Estimated Gestational Age and Fetal Weight Calculator The calculator below uses Hadlock equations to estimate the gestational age [11,12, 46 ] and the Shepard and Hadlock equations to estimate the fetal weight 12-15]. al., Fetal crown-rump length: reevaluation of relation to menstrual age (5-18 weeks) with high-resolution real-time US. Further trials are needed."  When there are factors that increase the risk for intrauterine growth restriction (IUGR) or the SFH is unreliable because of maternal obesity, twin pregnancy, polyhydramnios, or the presence of uterine leiomyomas (fibroids) ultrasonography may be a better screening modality for growth problems in the fetus. Sonographic evaluation of intrauterine growth retardation. Prenatally the sonographically estimated fetal weight is used together with weight tables to evaluate fetal growth. The SOGC recommends the earliest ultrasound with a crown rump length equivalent to at least 7 weeks (or 10 mm) should be used to determine the gestational age. The SOGC also recommends "...either the best CRL or the average of several satisfactory measurements should be used." The ACOG recommends "The measurement used for dating should be the mean of three discrete CRL measurements when possible..." .
Correct evaluation depends on the accuracy of the gestational age being used , the precision of the weight measurements , and using a weight curve that represents the population being studied.