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A member asked:

When you subtract 2 weeks from the ga provided by an ultrasound, does that give you the estimated fertilisation age or the estimated fetal age?

A doctor has provided 1 answer

Yes: When estimating gestational age by using an ultrasound scan, 2 weeks are added to the fetal age (the fetal age is the fertilisation age).

Dr Altman and 4 doctors agreed

Answered 5/23/2016

4.2k views

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Preg test on 3/20. LMP 2/7/ ,41 day cycle. last time had intercourse 2/28 ovulated 3/2. how far am I? I know my fetus is 3 1/2 wks, but preg calculator says 6wk? also when is the gestational sac seen on ultrasound based off conception. hcg is 1235

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Don't need to pinpoint conception day, but two first trim ultrasound give same due date we have no lmp to go off, how accurate is age of our baby?

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