Many doctors now suggest people consider getting their DNA checked for genetic diseases before starting a family. Alice Klein decided to take the test

I couldn’t help trembling slightly as I collected DNA from my mouth to send away for testing. My husband and I want to know our chances of having children with fragile X syndrome, which is passed on by the mother, so I was doing the test to see if I am a carrier.

The test also screens for cystic fibrosis and spinal muscular atrophy – if I am a carrier for either of those, my husband will get tested too. We don’t have any of these conditions ourselves, and we don’t know …

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