Increased Likelihood of Pregnancy from Sex on the Two Days Before Ovulation
ACOG ePoster. Johnson S. Apr 27, 2018; 212145; 5B
Dr. Sarah Johnson
Dr. Sarah Johnson
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Abstract
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Introduction: Introduction: Home ovulation tests are a convenient method to maximize chances of becoming pregnant naturally. This study examined intercourse patterns in women using tests and likelihood of pregnancy in relation to timing.

Methods: Methods: Women seeking to conceive used Clearblue Advanced digital ovulation tests to time intercourse, kept an intercourse diary and collected daily urine samples for 1 cycle. The home ovulation tests detect estrogen rise to identify the onset of the fertile period (approximately 4 days prior to ovulation) and Lutenising hormone (LH) surge (24h prior to ovulation). LH was also measured using AutoDELFIA to assign ovulation day. From the wider population of 1925 volunteers with sufficient data, comparative analysis was conducted on all viable pregnancies (n=288), and a random selection of ovular cycles from not pregnant volunteers (n=677).

Results: Results: One cycle conception rate was 15%. Women were able to effectively target intercourse to their fertile period using home tests, with 60% having sex on day of LH surge compared to
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