No: Most mutations that cause CF are known and are tested for at birth. However, rare subtypes (that are generally not as severe) are not all typed yet and therefor aren't tested for.
Answered 6/10/2014
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CF screening: The test performed at birth is a screening test and may miss some cases of cf. If your child develops symptoms of the disease or if there is a family history of cf, a follow up test may be ordered by your physician.
Answered 3/16/2014
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