Triple X syndrome is also called trisomy X, triplo X syndrome and XXX syndrome.

CNN: Triple X syndrome

Bella was born with Trisomy 18, a serious chromosomal condition that interferes with development.

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Bella, the youngest of Santorum's seven children, suffers from a rare chromosomal disorder called Trisomy 18, which causes severe medical and developmental problems.

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Santorum canceled campaign events for Monday after daughter Isabella, who suffers from a chromosomal condition called Trisomy 18, was hospitalized for the second time this year.

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He and his wife of 22 years, Claudia, have no children, and the cause became important to them after their niece was born with trisomy 13, a syndrome caused by an extra 13th chromosome.

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Bella suffers from a chromosomal condition called Trisomy 18.

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In her lab, Dr. Cherry said she had found four out of six positive results for Trisomy 18, or Edwards syndrome, which the tests also detect, appeared to be false alarms after follow-up testing.

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He also acknowledged the decision was not entirely political, saying the past weekend was a "time of prayer and thought" as he and his family cared for his daughter Isabella, the youngest of Santorum's seven children, who suffers from Trisomy 18, a chromosomal condition.

CNN: Santorum's decision came down to odds and his daughter