Sex ratio in ectopic gestations

Area of Science:

• Reproductive Medicine
• Genetics
• Obstetrics

Background:

• Ectopic pregnancy is a significant cause of maternal morbidity.
• Understanding factors influencing ectopic implantation, including fetal sex, is crucial.

Purpose of the Study:

• To determine the sex of fetuses in ectopic pregnancies.
• To investigate if fetal sex influences the likelihood of ectopic implantation.

Main Methods:

• Sex assignment was performed on 80 ectopic pregnancy cases.
• Tissue sections of chorionic villi were stained with quinacrine to identify X-chromatin (Barr body) and Y-chromatin.

Main Results:

• Sex determination revealed 51.2% X-chromatin-positive (female) and 47.5% Y-chromatin-positive (male) fetuses.
• A small percentage (1.3%) showed both X- and Y-chromatin in the same nuclei.
• The sex ratio of ectopic gestations was 0.92 males to 1 female.

Conclusions:

• The observed sex ratio in ectopic pregnancies is close to the expected population ratio.
• These findings suggest that fetal sex does not appear to predispose to ectopic implantation.