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Gina Kolata traveled to Utah to visit two families caring for babies with trisomy 18 and the doctor who counsels them.

Down syndrome is a genetic disorder caused by the presence of an extra copy of chromosome 21, also known as trisomy 21.

But Down syndrome — also known as trisomy 21 — is a remarkably variable disease.

They screen for chromosomal disorders such as trisomy 13 and 18, which often end in miscarriage or stillbirth, Down syndrome and extra or missing copies of sex chromosomes.

The trisomy 18 diagnosis came Nov. 28, the same day the Texas Supreme Court heard arguments in another case brought by a group of physicians and women who were denied abortions.