HELP -- Down's syndrome test during pregnant.

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well, my wife has this tested one week ago and got the value of 670:1 in 21 item today lower than the standard value 270:1 but she found others are over 10000:1,and i sourced the info from web and found it should be ok with us, but she worried that a lot and so could anybody here kindly help to offer any useful info or websites in your country with your knowledge which describe this test in detail for my reference, thanks for that before hand. By the way, we did the B-Ultrasonic as per doctor's suggestion and found nothing wrong and doctor also advise to check periodically. really really thanks ............