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Fertilization in IVF

In IVF, eggs are collected and fertilization takes place in a laboratory. The resulting embryos are cultured before transfer or freezing.

Conventional IVF and ICSI

Conventional IVF places eggs and sperm together. ICSI involves injecting a single sperm into an egg. Both are laboratory fertilization approaches.

Insemination

Insemination places sperm in the reproductive tract around ovulation. IUI involves the uterine cavity, while ICI involves the cervix. It does not include laboratory fertilization and embryo transfer.

Assessment comes first

Ovulation, tubal status, semen findings and other examination results inform the treatment discussion. The treating doctor determines which pathway to consider.

Comparing the treatment stages

Stage	Insemination	IVF
Ovulation or stimulation	Monitoring is timed to ovulation	Stimulation and monitoring precede retrieval
Egg retrieval	Not part of the insemination procedure	Eggs are collected for laboratory fertilization
Fertilization	Takes place within the body	Takes place in the laboratory
Embryo culture	Not part of the procedure	Embryos are cultured before transfer or freezing
Genetic testing of embryos	Not part of insemination	May be planned within an IVF cycle

Factors in the medical assessment

For insemination, the assessment includes ovulation, tubal patency and semen findings. The hospital describes the need for at least one functioning, patent fallopian tube.

IVF may be discussed in relation to tubal problems, ovulatory disorders, endometriosis, sperm factors or earlier treatment history. The choice depends on the complete assessment, not the apparent simplicity of one procedure.

Using donor sperm

The hospital can coordinate donor sperm arrangements for an agreed treatment plan. An IUI- or ICI-prepared product should be selected in discussion with the clinic, and donor medical information is reviewed alongside the recipient’s findings.

Compare the stages rather than the names alone

Scroll across to view all columns.

Question	Insemination	IVF
Where does fertilization take place?	In the reproductive tract after prepared sperm is placed.	Eggs and sperm are handled in the laboratory after retrieval.
What is reviewed beforehand?	Ovulation, tubal status, semen and the wider reproductive history.	Ovarian and semen findings, earlier treatment and the proposed laboratory pathway.
Where does embryo testing fit?	There is no laboratory embryo-biopsy stage within insemination itself.	PGT may be discussed as a separate part of the IVF plan when relevant.
How are later attempts planned?	Earlier monitoring and insemination results are reviewed.	Stimulation, maturity, fertilization, embryo and transfer records can all inform review.

Bring the earlier records before changing treatment

A change from insemination to IVF should follow review of the actual findings. The same number of attempts does not define the next step for every patient.

The adenomyosis and earlier insemination case describes one individual pathway. For your own assessment, use the insemination information, IVF guide and examination checklist guidance.

IVF and insemination