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Questions about Ultrasound/Low AFP/and actual EDD

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Old 03-10-2005, 07:01 PM   #1
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jodimarie75 HB User
Questions about Ultrasound/Low AFP/and actual EDD

I had a detailed ultrasound today due to abnormal results on my quad screen test (low AFP for Downs Synd). I was a complete wreck all week, dreading the thought of having a risky amnio. I am 30yrs old and my ratio was 1:207. After having the ultrasound and finding everything normal and no soft markers for downs and nothing abnormal, my risk went down to 1:310. There are no birth defects,etc in either mine or my husbands family. So we opted not to have the amnio since my risk for downs was lower than risk for miscarriage w/ amnio(1:200). I know the timing you have the screening done (quad screen) is important in determining your risk. Well now after having the ultrasound today, I don't know how pregnant I am? Here;s my history:

OB's EDD according to 10 week vaginal ultrasound-8-13-05 (OB's office)
Ultrasound Tech's EDD according to today's ultrasound-8-7-05 (Hospital)

I thought I was 17w5 days today, but todays ultrasound confirms 18w3days according to measurements. Here's the thing...I'm pretty sure I conceived on Nov 2oth, which is 3 weeks past my LMP (so I didn't ovulate on time) so I am very confused on what my actual age of pregnancy is. If I count back from conception I am 15w5days. Do I add 2 weeks or 3 weeks? Please somebody help me figure this out?


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Old 03-10-2005, 08:44 PM   #2
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Re: Questions about Ultrasound/Low AFP/and actual EDD


Old 03-10-2005, 10:00 PM   #3
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nyxin HB Usernyxin HB Usernyxin HB User
Re: Questions about Ultrasound/Low AFP/and actual EDD

i have the same thing as far as wierd dating. my LMP was 6/8/04--- but when i had my ultrasound it said that i was 11 days behind that date (if ovulation is 14 days into a cycle). meaning that i ovulate at 25 days into a 35-37 day cycle. so i only have 10ish days in my luteal phase. that happens to be the absolute cut off to be able to conceive. that being said, they took the ultrasound measurements into consideration when dating me and therefore scheduling the screening tests. if they would have went off my LMP then i would say my results would be off too. ask them if they took your odd dating into consideration.
Married October 02
DS Caden Grey June 03
DS Morgan Keenan March 05
C-Section Aug 1st 08 with baby BOY #3

Old 03-12-2005, 11:45 AM   #4
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jodimarie75 HB User
Re: Questions about Ultrasound/Low AFP/and actual EDD

Thanks Nyxin. Did anyone else have a long menstral cycle and confused about your due date??


Old 03-12-2005, 11:59 AM   #5
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Tash16 HB User
Re: Questions about Ultrasound/Low AFP/and actual EDD

I aint really thought about it but my lmp was 15th oct 04 and all along i av had the same edd given to me which is 24th july 05. sorry that i am not of much help but i aint really that good with the dates thingy lol.

Old 03-12-2005, 03:00 PM   #6
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valleygurl HB User
Re: Questions about Ultrasound/Low AFP/and actual EDD

Jodi, I have worked in the High Risk Labor and Delivery unit of our local Trauma Center for many years. When our patients present to our unit we ALWAYS use the date of the EARLIEST ultrasound. Early ultrasounds are the most accurate, so with that being said I would most definately go by the EDC you were given from your very first ultrasound. Hope this helps and congratulations!!!!


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