I did it last week. My doctor said it will be 90% accurate if the test be done during 11 to 12 weeks, the test will be 85% if the test be done during 12 to 13 weeks, over 13 weeks, they will not suggest to do it, then need to wait until 16 weeks to do another kind of the test.
The test is simple, just measure the thickness of the back of neck and get a small tube of your blood. Cost around $1080.00 the result will be notified in three days.
My problem is that my period date and the size is different, I should be 9 weeks but the size is only 6 weeks. If the week number is critical for such test, if I follow the date of the size tha I am just afraid that it is not accurate.
My period is not regular too. I think you better to ask the doctor of comments that should be follow the size or the weeks. Otherwise, you can wait until 16 weeks for 抽 胎水, that will be 100% accurate, but the cost will be even higher, around $4800
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