Calculation of Gestational Age:
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1 - Where possible, exact gestation should be calculated
in days from last known menstrual period.
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2 - In ART treatment, the exact gestation is the number of
days since hcG plus 13 days
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3 - Frozen embryo transfer, exact gestation depends on whether
it is a natural cycle or programmed cycle.
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Natural cycle - days since LH surge plus 13
- Programmed cycle - days
since embryo transfer plus 16 days.
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