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  1. #41
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    Hi there, don't know if you're still interested in the reasons why different places give conflicting time frames for having the tests done but here is an excerpt from an article written by the guy that 'discovered/designed' the NT scan.
    Essentially it says it's more accurate to have bloods at 10wks and he scan at 12-13 but it makes it easier for collating results and giving a quick answer to do it all on the one day. Hope that helps


    Timing of ultrasound and blood testing within the first trimester
    One option in first-trimester combined screening for trisomy 21 is to perform biochemical and ultrasonographic testing as well as to counsel women in one-stop clinics for assessment of risk (OSCAR) (Bindra et al., 2002; Spencer et al., 2000d). This has been made possible by the introduction of biochemical analyzers which provide automated, precise and reproducible measurements within 30 min of obtaining a blood sample. The ideal gestation for OSCAR is 12 weeks because the aim of the first-trimester scan is not just to screen for trisomy 21 but also to diagnose an increasing number of fetal malformations, and in this respect the ability to visualize fetal anatomy is best at 12 weeks. The detection rate of trisomy 21 with OSCAR at 12 weeks is about 90% at a false-positive rate of 5%.

    An alternative strategy for first-trimester combined screening is for biochemical testing and ultrasound scanning to be carried out in two separate visits, with the first done at 9 to 10 weeks and the second at 12 weeks. It has been estimated that this approach would improve the detection rate from 90% to 93 to 94%.

    A third option would be to perform the scan at 12 weeks and optimize the performance of biochemical testing by measuring PAPP-A at 9 weeks and free β-hCG at the time of the scan at 12 weeks or even later with an estimated detection rate of 95%.

    http://www.fetalmedicine.com/synced/...euploidies.pdf

  2. The Following 2 Users Say Thank You to moose81 For This Useful Post:

    Legeyt  (22-07-2014),Phony  (22-07-2014)

  3. #42
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    It makes no sense to me why there's no definite answer the the question and timing varies from centre to centre.

    Anyhoo, I got my blood test yesterday and go for my scan tomorrow

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    moose81  (22-07-2014)

  5. #43
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    I was also looking in to this a little more as I can only have my blood tests at either 10 weeks or 12 weeks as I am away for 2 weeks. Everything I looked at suggested 10 weeks for the blood test (as does that article) but I still can't 100% figure out why except that it "gives an accurate reading". Oh well. I think I'd happily do either but am opting to get bloods this week & the NT scan when I get back from OS just to be sure the blood work is ready on time. Thanks though!

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    moose81  (22-07-2014),Phony  (22-07-2014)

  7. #44
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    Hey everyone, just an update.
    the scan went really well.
    Text book perfect they said, and I got a low risk result, so unbelievable relieved at the minute.
    I don't know how I'd cope with a dodgy result as I really didn't want to have to make the decision about an amnio having already miscarried this year.
    All good though.
    So happy

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    Quote Originally Posted by Phony View Post
    Hey everyone, just an update.
    the scan went really well.
    Text book perfect they said, and I got a low risk result, so unbelievable relieved at the minute.
    I don't know how I'd cope with a dodgy result as I really didn't want to have to make the decision about an amnio having already miscarried this year.
    All good though.
    So happy
    That's wonderful news Phony! I'm so pleased to hear all is well. Keep growing strongly for you mumma little one xx


    Me + DH = DS1 (6), DS2 (2) and #3 due September 8th

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    Phony  (24-07-2014)

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    Ah thanks Chippa, I'm walking on air

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    Chippa  (24-07-2014)

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    I believe one before the other is how I had mine, and not on the same day. Just ensure you get it done before 13 weeks 6 days cos they're really funny about it.

    mother to a beautiful baby boy

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    Phony  (24-07-2014)

  14. #48
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    Quote Originally Posted by Phony View Post
    Hey everyone, just an update.
    the scan went really well.
    Text book perfect they said, and I got a low risk result, so unbelievable relieved at the minute.
    I don't know how I'd cope with a dodgy result as I really didn't want to have to make the decision about an amnio having already miscarried this year.
    All good though.
    So happy
    Good stuff! Fingers crossed the same for me in a couple of weeks!
    Great that you didn't have to do anything invasive

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    Phony  (24-07-2014)

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    Best of luck for yours Legeyt

  17. #50
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    samilia is offline Our family is almost complete <3
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    OHHH @Phony!!!! So so happy for you!! I was wondering how you were going and decided to do some stalking on you 😜... I'm so happy you conceived again and this ones 12 weeks scan turned out perfect!! Wow!! When are you due? I'm nearly there with my due date right round the corner... Probably getting induced though next Friday. Fingers X'd


    Me 25 💑 DH 29
    👶🎀DD #1 -Born 30.11.08 💗
    👶🎀DD #2 -Born 28.03.11 💜
    👶🎀DD #3 - Due 17.09.14 💖


 

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