8 Questions
What percentage of pregnancies are estimated to end in spontaneous abortion?
50%
When are abnormal zygotes usually lost?
2 to 3 weeks of fertilization
What proportion of pregnancy losses are a result of chromosomal abnormalities?
Half
Which condition is characterized by a partial deletion of the short arm of chromosome 5?
Cri-du-chat syndrome
What is the approximate incidence of trisomy 18 in newborns?
1 in 5,000
Which abnormality is associated with a cat-like cry, microcephaly, and congenital heart disease?
Cri-du-chat syndrome
What percentage of trisomy 13 infants die within the first month after birth?
>90%
What is a common feature observed in patients with trisomy 18?
Low set ears
Learn about the prevalence of abnormal zygotes and spontaneous abortion due to chromosomal abnormalities in pregnancies. Understand the challenges in detecting these abnormalities before a woman realizes she is pregnant.
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