ABSTRACT
3.1. Concerning spontaneous early abortions (first trimester), which of the following statements is/are true?
The incidence of chromosome abnormalities in the abortuses is between 5 and 15%.
Trisomy 21 is the most frequent single chromosome abnormality in the abortuses.
The incidence of 45,X karyotype in the abortuses is approximately the same as in the liveborn population.
There is an increased incidence of abnormal karyotype in parents who have had frequent (more than four) spontaneous miscarriages.
Trisomy in an abortus implies an increased risk for younger mothers that a subsequent pregnancy would also be trisomie.
