Jansen CHJR, et al. - Here, researchers study whether the pregnancy outcome of intrauterine insemination (IUI) is influenced by a longer time interval between semen processing and insemination. No negative impact is seen on pregnancy rate when IUI of processed sperm is delayed until the next day. This approach allows additional flexibility for couples when the male partner is not available on the day of ovulation, and it allows for a spread of workload in the laboratory.