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If you don’t know your due date, use our due date calculator to find out.

BPD - OFD - HC | Femur and Humerus (FL HL) | Abdominal Circumference (AC) Fetal Weight Percentile Charts | Fetal Growth Percentile Charts Measurement Standards | Ultrasound Measurement Chart | Crown-Rump Length After the first trimester of pregnancy a multiparameter assessment of gestational age is advocated.

Until about 20 weeks, babies are measured from the crown (or top) of the head to the rump (or bottom).

This is because a baby's legs are curled up against his torso during the first half of pregnancy and very hard to measure. See our pregnancy timing article to learn how the weeks of pregnancy are counted and your baby's gestational age is determined. Improved birth weight table for neonates developed from gestations dated by early ultrasonography. https://gov/pubmed/9315150 [Accessed September 2016]Hadlock FP, et al. Fetal crown rump length: Reevaluation of relation to menstrual age (5-18 weeks) with high resolution real-time US. https://gov/pubmed/1732970 [Accessed September 2016]Usher R, et al. Intrauterine growth of live-born Caucasian infants at sea level: Standards obtained from measurements in 7 dimensions of infants born between 25 and 44 weeks of gestation. https://gov/pubmed/5781799 [Accessed September 2016]Wigglesworth JS.

When applied to 3052 naturally-conceived singletons scans, The Monash Chart generated estimated due dates that were different to all existing charts ( all comparisons).

Since they use an intermediate table, they can support constraints and unique indexes over the results.

Similarly, the magnitude of increased optical density above baseline at 450 nm (delta OD 450) by amniotic fluid spectrophotometric measurement is used to predict the severity of fetal hemolytic disease in pregnancies complicated by rhesus isoimmunization.

Test results are interpreted based on Liley's zones relative to gestational age.

This should include at least two fetal measurements (usually biparietal diameter (BPD) and femur length (FL)) plus a consideration of additional parameters such as head circumference (HC), occipitofrontal diameter (OFD), abdominal circumference (AC) and humerus length (HL).

Measurements in the beam axis are more accurate than those made across the axis. Crown-Rump Length (CRL) and femur length) should be measured across the axis.