When to Move From IUI to IVF: A Practical Guide for Gynaecologists

Intrauterine insemination (IUI) is often the first treatment offered to couples with infertility. It is less invasive and less expensive than IVF, but it is not suitable for everyone, and continuing it for too long can waste valuable time. This guide sets out when IUI is reasonable, how many cycles to offer, and when to refer for IVF.

Who is IUI suitable for?

IUI requires at least one patent fallopian tube and a reasonable number of motile sperm after preparation. Common indications include:

• Unexplained infertility, usually combined with ovarian stimulation
• Mild male factor infertility
• Ovulatory disorders such as PCOS, after ovulation induction alone has not resulted in pregnancy
• Cervical factor or sexual dysfunction that prevents intercourse
• Donor sperm insemination

Who should go straight to IVF?

IUI is unlikely to help, and IVF (or ICSI) should be discussed first, when there is:

• Bilateral tubal blockage or significant tubal damage
• Severe male factor infertility, for example a very low total motile sperm count after preparation
• Advanced female age with reduced ovarian reserve, where time is limited
• Moderate to severe endometriosis
• A need for preimplantation genetic testing for a known genetic disorder

How many IUI cycles should be offered?

Most pregnancies after IUI occur within the first three to four cycles. The chance per cycle tends to fall after that, so many clinicians review the plan after three cycles and consider IVF if there has been no pregnancy. The exact number should be individualised, taking into account:

• The woman's age and ovarian reserve
• Duration of infertility
• Semen parameters after preparation
• How well the ovaries responded to stimulation
• The couple's preferences and finances

For factors that influence each cycle, see our article on factors affecting IUI success.

Avoiding multiple pregnancy

Ovarian stimulation with IUI carries a real risk of multiple pregnancy if several follicles develop. Good practice includes:

• Using the lowest effective dose, often letrozole or low-dose gonadotropins
• Monitoring follicle growth with ultrasound
• Cancelling or converting the cycle when too many mature follicles develop, rather than proceeding with insemination

Our guide to ovulation induction protocols covers dosing in detail.

IUI, IVF and the ART (Regulation) Act, 2021

In India, the ART Act and the ART Rules, 2022 classify ART clinics into:

• Level 1 clinics, which may perform IUI and related procedures
• Level 2 clinics, which may perform IVF, ICSI and other procedures involving gamete or embryo handling outside the body

All ART clinics must be registered on the National ART and Surrogacy Registry, maintain records and obtain written informed consent. Gynaecologists offering IUI should therefore make sure their clinic is registered at the appropriate level and that they have a clear referral pathway to a registered Level 2 centre for couples who need IVF. Clinics must also never offer or advertise sex selection, which is prohibited under both the ART Act and the PCPNDT Act.

Counselling the couple

• Set expectations from the start: agree how many IUI cycles will be tried before reviewing the plan
• Explain the per-cycle chance in plain terms, based on age and diagnosis, without promising outcomes
• Discuss the cost and time of repeated IUI versus moving to IVF sooner
• Document the plan and the consent

Frequently asked questions

How many IUI cycles should be tried before IVF?

Most pregnancies after IUI happen within the first three to four cycles, so many clinicians review the plan after three unsuccessful cycles. The number should be individualised based on age, diagnosis and response.

Can IUI be done with one blocked tube?

IUI can be considered if at least one tube is open and healthy, ideally on the side of the developing follicle. Tubal status should be confirmed before starting treatment.

Does a gynaecologist need a licence to perform IUI in India?

Under the ART (Regulation) Act, 2021, clinics performing IUI must be registered as ART clinics (Level 1) on the National ART and Surrogacy Registry and follow the Act's rules on consent and record keeping.

Learn IUI and ovulation induction hands-on

The Advanced Hands-on IUI & Ovulation Induction Masterclass covers patient selection, monitoring, semen preparation and insemination technique. Read our step-by-step IUI procedure guide, or contact our team.

This article is educational content for healthcare professionals and trainees. It is not medical advice and does not replace clinical judgement, current guidelines or the ART (Regulation) Act 2021 and Rules 2022.