IUI vs IVF: Which Fertility Treatment Is Right for You?

IUI vs IVF: Which Fertility Treatment Is Right for You?

The core difference: IUI (Intrauterine Insemination) places prepared sperm directly inside the uterus, timed to ovulation — fertilisation still happens naturally inside the body. IVF retrieves eggs, fertilises them in the laboratory, and places the resulting embryo back into the uterus. IUI is simpler, cheaper, and less invasive. IVF is more effective.

How Each Treatment Works

IUI — The Process:

1. Mild ovarian stimulation (letrozole tablets or low-dose FSH injections) stimulates 1–2 follicles
2. Monitoring ultrasound confirms follicle size (17–20mm target)
3. Trigger injection (hCG) times ovulation
4. 36 hours later: semen sample is collected, washed, and concentrated
5. Prepared sperm is placed into the uterine cavity via a thin soft catheter — a 5-minute outpatient procedure
6. Progesterone support given; pregnancy test in 14 days

IVF — The Process:

1. Intensive ovarian stimulation (FSH injections daily for 10–12 days) develops 8–15 follicles
2. Daily monitoring scans track follicle growth
3. Trigger injection → egg retrieval under sedation
4. Eggs fertilised in the laboratory (with ICSI in most cases)
5. Embryos cultured to Day 5 (blastocyst)
6. Best embryo transferred to uterus; surplus frozen
7. Progesterone support; pregnancy test in 14 days

Success Rates: The Evidence-Based Comparison

Per ASRM Practice Guideline on IUI (2023) and ESHRE Guideline on Unexplained Infertility (2023):

The per-cycle gap is large — but the cost gap is larger. Three IUI cycles at ₹15,000–₹22,000 each costs ₹45,000–₹66,000 combined. One IVF cycle costs ₹2,50,000–₹3,50,000. For patients under 38 with no contraindication to IUI, 3 IUI cycles is a clinically and economically rational first step.

When IUI Is the Right Starting Treatment

ASRM 2023, ESHRE 2023, NICE CG156 (updated 2023), and FOGSI Guidelines on ART (2022) all recommend IUI as appropriate first-line treatment when:

• Unexplained infertility in women under 38 with documented tubal patency
• Mild male factor — total motile sperm count (TMSC) 5–20 million after preparation
• Ovulatory dysfunction (PCOS) — IUI combined with letrozole (first-line per PCOS 2023 International Guideline)
• Cervical factor — bypasses cervical hostility or inadequate cervical mucus
• Donor sperm cycles — same-sex couples, single women, or male azoospermia where donor is chosen
• Cost-constrained patients — 3–4 IUI cycles before IVF is explicitly endorsed by NICE as cost-effective for unexplained infertility

TMSC thresholds for IUI (ASRM 2023):

• TMSC >10 million: IUI appropriate, reasonable per-cycle success
• TMSC 5–10 million: IUI may be attempted but lower per-cycle success
• TMSC <5 million: IVF + ICSI recommended — IUI not cost-effective

When to Skip IUI and Go Directly to IVF

Per ASRM 2023, ESHRE 2023, ACOG Practice Bulletin on ART (2022), and FOGSI 2022:

Absolute indications for IVF first:

• Bilateral tubal blockage (confirmed by HyCoSy, HSG, or laparoscopy) — IUI requires at least one patent tube
• Severe male factor (TMSC <5 million after preparation; azoospermia)
• Failed 3–6 IUI cycles in patients under 38 (move to IVF)
• Need for preimplantation genetic testing (PGT-A or PGT-M) — only possible via IVF
• Age 38 and over — IUI per-cycle rates too low for time-efficient care

Strong preference for IVF (not absolute):

• Stage III–IV endometriosis — adhesions impair tubal function; IVF more effective (ESHRE Endometriosis Guideline 2022)
• Diminished ovarian reserve — IVF is more time-efficient than IUI when reserve is limited
• Recurrent implantation failure or miscarriage requiring embryo testing
• Moderate male factor with poor morphology and DNA fragmentation

How Many IUI Cycles Before Moving to IVF?

ASRM 2023 recommendation: 3–6 cycles of IUI with ovarian stimulation in women under 38 with unexplained infertility or mild male factor before proceeding to IVF.

NICE CG156 (2023): Up to 6 cycles of IUI with stimulation in women under 40 with unexplained infertility.

Key consideration: Cumulative IUI success does not rise indefinitely. After 6 cycles, the per-cycle rate does not improve and any additional benefit over IVF is lost. ACOG notes that beyond 3–4 cycles, the incremental benefit of further IUI is outweighed by the time cost, particularly in women over 35.

Cost Comparison — India 2025

For women under 38 with good prognosis, 3 oral-stimulation IUI cycles (₹25,000–₹70,000 combined) remain significantly cheaper than one IVF cycle and represent sound evidence-based initial treatment.

Special Populations

Single women and same-sex couples: IUI with donor sperm is the first-line approach and is explicitly endorsed as appropriate in guidelines from ASRM, ESHRE, and NICE for single women. In India, this is governed by the ART Act 2021 (anonymous donor sperm from licensed banks; donor must have prior live birth; maximum 3 donations per donor).

PCOS: The 2023 International Evidence-Based Guideline (ASRM/ESHRE/NHMRC) recommends letrozole + IUI as first-line ART for PCOS anovulation. IVF is reserved for failed oral stimulation after 3–6 cycles.

Reference: ASRM Practice Committee — Intrauterine Insemination (IUI), 2023. ESHRE Guideline — Unexplained Infertility, 2023. ACOG Practice Bulletin No. 197 — Infertility, 2022 (reaffirmed). NICE Clinical Guideline CG156 — Fertility Problems, updated 2023. FOGSI Guidelines on ART, 2022. International Evidence-Based Guideline for PCOS — ASRM/ESHRE/NHMRC, 2023.