Crl dating table


04-Feb-2017 15:57

At any gestation, if the ultrasound fetal measurements of each parameter are not in agreement, the reason for this difference should be evaluated.

This is preferable to just averaging all values to arrive at an estimated gestational age.

If the ultrasound measurements are in agreement and differ from menstrual dates by more than one week prior to 20 weeks a new estimated due date should be calculated and recorded.

The reduced accuracy of prediction of gestational age after 20 weeks must be appreciated.

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.

It is typically determined from ultrasound imagery and can be used to estimate gestational age.

Fetal growth retardation or macrosomia may be missed or incorrectly diagnosed owing to errors in gestational age assignment.

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

Again, inaccurate assessment of gestational age will lead to errors in assessing the severity of fetal sensitization by the delta OD 450.

The articles assist in the understanding of the anatomy involved in treating specific conditions and performing procedures.

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In that situation, other parameters can be used in addition to CRL.



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