[Does ultrasound have an adverse effect on the fertility of women?]

Fifty women who were subfertile received artificial insemination from donors (A.I.D.) with ultrasound monitoring of ovulation. They were compared with an identical number of women who were inseminated without ultrasound control. The series side by side showed that there was a lower fertilisation rate in those who were monitored (4.2% compared with 6.2%) per month on an average over six months as compared with those who were not monitored by ultrasound, and those who were monitored took significantly longer to become pregnant than those who were not monitored. Because of these results the authors wonder whether ultrasounds are harmful for ovulation.