Paternity Testing: Who is the Likely Father? - Obstetrics and Gynecology

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When it comes to determining paternity, especially in complex situations like the one you've described, DNA testing is the most reliable method. However, understanding the biological and medical aspects of conception can also provide some insight into your question.

In your scenario, you had sexual relations with two men, A and B, around the time of ovulation. A key factor to consider is the timing of intercourse in relation to ovulation, as this significantly influences the likelihood of conception. Ovulation typically occurs about 14 days before the start of your next menstrual period, and sperm can live inside the female reproductive tract for up to five days. Therefore, if you had intercourse with A on May 1, just before ovulation, and with B on May 2, 3, and 13, the timing suggests that both could potentially be the father.

However, the fact that B had a vasectomy in January and had a sperm count of zero in April is crucial. A vasectomy is a surgical procedure intended to be a permanent form of male contraception, and it typically takes several months for sperm to clear from the reproductive tract after the procedure. If B's sperm count was indeed zero at the time of your potential conception, he would not be able to father a child, regardless of the timing of intercourse.

Given this information, if you were to become pregnant, the likelihood of A being the father would be significantly higher, especially since he had a viable sperm count and the timing of intercourse was close to your ovulation. If B were to undergo a sperm count test now and it shows zero, this would further support the conclusion that A is the likely father.

In terms of paternity testing, if a pregnancy occurs, a DNA paternity test can definitively determine the biological father. This test can be conducted using samples from the child, the mother, and the alleged father(s). It is a straightforward process that involves collecting DNA samples, usually through a cheek swab, and analyzing them for genetic markers.

In summary, based on the information provided, if you were to become pregnant, A is the more likely father due to the timing of intercourse and B's medical history of having a vasectomy and a confirmed zero sperm count. If you have concerns about pregnancy or paternity, it would be advisable to consult with a healthcare provider who can guide you through the next steps, including potential testing and any necessary medical care.