The purpose of this study is to ascertain whether using ultrasound guidance during intrauterine insemination (IUI) could increase pregnancy rates.

Inclusion Criteria:

• The woman's inclusion criteria in our IUI program were at least one patent tube, normal cavity, basal FSH < 10 mU/mL and age under 40 years.
• IUI with husband's sperm (IUI-H) was indicated when, after sperm preparation, at least 5 million motile spermatozoa were recovered; this was performed in 58 cases (79.45%).
• In the remaining 15 cases (20.55%), IUI was performed with donor sperm (IUI-D) either because of azoospermia (n=6) failure to recover spermatozoa during testicular biopsy (n=5) or in women without a male partner (n=4).

Exclusion Criteria:

• Previous infertility treatments had been carried out.