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The possiblity of your child having Niemann Pick is beyond slim. You need to be a carrier (1:4 chance if sister is a carrier) and your husband/boyfriend would have to be a carrier (odds of 1:40,000). And then, if you and your husband are both carriers there is only a 1:4 chance your offspring will have it. Dont even worry about it. The odds are so astronimical. I am assuming, since you stated that your sister's daughter will live to 2.5yrs that she has Niemann Pick disease Type A (both parents must carry the Type A mutuation). btw...there are 3 different Types of Niemann Pick Disease. Persons with Type B can live full lives.
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