It depends on the quality of the semen sample and the type of vial used. If the standard process is followed and it is a high-quality sample, a single vial might be enough for an IUI cycle. Keep in mind that donor samples are of excellent quality.
In accordance with parameters such as quality and quantity, each sperm bank or clinic has a different criteria regarding how many vials should be thawed for each technique.
Suggested for you: IUI with Donor Sperm – Definition, Process & Success Rates.