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???   2011-06-22 13:07 ????
???   2011-06-26 10:13 ???????????????

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2
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Down\'s??????????135???????B??-????

21-?(trisomy2lsyndrome)???;??21???1846Sequin??1866Down???Down\'s?1959Lejeune??21???19601961LejeuneClarke????????:21-???????????????M?0.32~3%?0.56~0.64%
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[?] ???????I????I????????????(??????????????)??????20~29????0.62~0.88?30~39?1.06~3.74?40~49
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.? ??????????????????????????????????25???10??47.5? ????????????????????????????cm=??5+80cm??????
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