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Pregnancy Dating Tool

Use this online tool to tell you when you should have your blood drawn.
BC ultrasound facilities may use different dating calculation charts (Lessoway or Robinson charts) for crown-rump length dating. 

This online dating calculator tool uses the Robinson chart.  

As such, depending on the ultrasound facility, there may be a crown-rump length gestational dating variance of 1-2 days.

SOURCE: Pregnancy Dating Tool ( )
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