Bpd ultrasound dating
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This information is vital for timing of appropriate obstetric care, scheduling and interpretation of certain antepartum tests, determining the appropriateness of fetal growth, and designing interventions to prevent preterm births, post-term births, and related morbidities.
Measurements of the CRL are more accurate the earlier in the first trimester that ultrasonography is performed.
The measurement used for dating should be the mean of three discrete CRL measurements when possible and should be obtained in a true midsagittal plane, with the genital tubercle and fetal spine longitudinally in view and the maximum length from cranium to caudal rump measured as a straight line.
Appropriately performed obstetric ultrasound has been shown to determine fetal gestational age accurately.
A consistent and exacting approach to accurate dating is also a research and public health imperative because of the influence of dating on investigational protocols and vital statistics.