A failed IVF cycle can be extremely disappointing.

Patients often ask: “What went wrong?”

Unfortunately, there is not always one identifiable cause.

IVF involves multiple biological steps, and failure can occur at different stages.

Not Every Follicle Contains a Mature Egg

Ultrasound measures follicles rather than eggs.

Some follicles may not yield an egg, and some retrieved eggs may be immature.

This is normal biological variation.

Not Every Egg Fertilises

Even when eggs and sperm appear satisfactory, not every mature egg fertilises normally.

ICSI can help overcome certain fertilisation barriers, particularly male-factor problems, but it cannot guarantee fertilisation.

Not Every Embryo Becomes a Blastocyst

Embryo development involves significant natural selection.

Some fertilised eggs stop developing before reaching the blastocyst stage.

This is not necessarily caused by anything the patient did during treatment.

Embryo Chromosomes Matter

One of the major reasons embryos fail to implant or pregnancies miscarry is chromosome abnormality.

This becomes increasingly common with female age.

An embryo can look morphologically good under the microscope yet still have a chromosome abnormality.

Does the Uterus Matter?

Yes, but implantation is a partnership between embryo and endometrium.

Conditions such as significant intracavity fibroids, polyps, adhesions or certain uterine abnormalities may influence implantation in selected patients.

However, not every unsuccessful embryo transfer means there is an endometrial problem.

What About the Embryology Laboratory?

IVF laboratory quality is extremely important.

Embryos require carefully controlled conditions, experienced embryologists and rigorous quality systems.

However, even excellent laboratories cannot eliminate normal human reproductive biology.

Should You Have Every IVF Add-On?

No.

After a failed cycle, it can be tempting to add multiple tests and treatments.

Before doing so, ask:

• What problem is this intervention addressing?
• Is that problem demonstrated in my case?
• Does good evidence show improved live birth?
• Are there risks?
• What is the cost?

Review the Entire Cycle

A post-IVF consultation can examine:

• Ovarian response
• Number and maturity of eggs
• Fertilisation
• Embryo development
• Sperm factors
• Endometrial findings
• Transfer procedure
• Treatment protocol

Sometimes useful modifications can be identified.

At other times, repeating treatment may be reasonable because biological variability alone can produce different results between cycles.

The Take-Home Message

IVF failure is rarely explained by one simple factor.

Egg number, egg quality, sperm, embryo development, chromosome competence and uterine factors can all contribute.

The most useful response is a structured review—not automatically adding every available test or treatment.