Should the Prenatal Biochemistry Laboratory be contacted if dating by second trimester ultrasound differs from the original dates calculated by LMP?
Yes, if dating by second trimester ultrasound differs by more than seven days from original dates, fax the ultrasound report to the Prenatal Biochemistry Laboratory at C&W (fax 604-876-3008) for possible recalculation of risk. The only exception would be when a screen result is positive for trisomy 18. In these cases, the screen will not be recalculated (because trisomy 18 is frequently associated with intrauterine growth restriction).
Related Questions
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