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IVF (in vitro fertilisation) is a fertility treatment where eggs are fertilised by sperm outside the body, then implanted into the uterus. Free notes.
IVF Process and Procedures is part of Hormonal coordination in humans in GCSE Edexcel Higher Biology.
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IVF (in vitro fertilisation) is a fertility treatment where eggs are fertilised by sperm outside the body, then implanted into the uterus. Free notes.
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Use this lesson to stay inside Hormonal coordination in humans while connecting the detail back to the wider Topic 7: Animal coordination, control and homeostasis topic.
Read the core explanations from IVF Process and Procedures before testing yourself from memory.
Around 1 in 7 couples struggle to conceive naturally. Sometimes the problem is blocked fallopian tubes, low sperm count, or hormonal imbalances that prevent normal ovulation.
When natural conception fails, doctors can use a technique called In Vitro Fertilisation - literally meaning 'fertilisation in glass'. Instead of fertilisation happening inside the woman's body, it happens in a laboratory dish.
Trap: Many students think IVF means 'test tube babies' - but no test tubes are used. The fertilisation happens in shallow laboratory dishes called petri dishes.
Normally, a woman releases just one egg per month during ovulation. For IVF to work, doctors need multiple eggs to increase the chances of success.
The woman is given hormone injections containing FSH (Follicle Stimulating Hormone) and LH (Luteinising Hormone). These are the same hormones her body produces naturally, but in much higher concentrations.
FSH causes several follicles in the ovaries to mature simultaneously, instead of the usual one. LH then triggers the final maturation of these eggs, preparing them for collection.
Trap: Students often confuse FSH with oestrogen. FSH stimulates egg maturation; oestrogen is produced by the maturing follicles as a result.
Once the eggs are mature (usually after 10-14 days of hormone treatment), they're collected from the mother's ovaries using a thin needle guided by ultrasound. This is done under sedation.
Meanwhile, sperm is collected from the father and prepared in the laboratory. The healthiest, most active sperm are selected for fertilisation.
Worked example: Laboratory Fertilisation Process
Describe how eggs and sperm are combined in the laboratory during IVF.
Answer: Eggs and sperm are combined in laboratory dishes, monitored for fertilisation, then cultured to develop into embryos.
After 2-5 days of development, the embryos are tiny balls of cells. Embryologists select the healthiest-looking embryos for transfer back to the mother.
Usually one or two embryos are inserted into the mother's uterus (womb) through the cervix using a thin catheter. This is called embryo transfer and doesn't require anaesthetic.
The remaining good quality embryos can be frozen for future use, avoiding the need to repeat the entire process if the first attempt fails.
Why only 1-2 embryos? Transferring more increases the risk of multiple births (twins, triplets), which can be dangerous for both mother and babies.
IVF success rates depend heavily on the woman's age. Under 35, about 40% of cycles result in live birth. This drops to around 15% for women over 40.
The process is physically and emotionally demanding. Hormone injections can cause side effects like mood swings and bloating. Multiple cycles may be needed, and there's no guarantee of success.
However, IVF has helped millions of couples worldwide have children they couldn't conceive naturally. It's particularly successful for blocked fallopian tubes and male fertility problems.
IVF questions often ask you to describe the process step-by-step or explain why certain hormones are used. Here's how to structure your answers for maximum marks.
Exam depth extension: In ivf process and procedures, connect why some couples need help having children to step 1: hormone treatment to produce multiple eggs using clear cause-and-effect statements. When you explain biological processes, include what changes, why it changes, and the consequence for cells, organisms, or populations. If calculations appear, show each step, include units, and end with a sentence that interprets the result in biological context.
Common exam mistake: Students write 'eggs are fertilised by sperm in test tubes'. The correct term is 'laboratory dishes' or 'petri dishes'.
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Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.
IVF success rates depend heavily on the woman's age: under 35, about 40% of cycles result in live birth, and this drops to around 15% for women over 40. Multiple cycles may be needed, and there is no guarantee of success.
In vitro literally means fertilisation in glass: in IVF, fertilisation happens in a laboratory dish instead of inside the woman's body. The fertilised eggs are then implanted into the uterus.
Embryo transfer is when one or two of the healthiest embryos are inserted into the mother's uterus through the cervix using a thin catheter. It does not require anaesthetic.
FSH and LH are given in IVF so that multiple eggs mature instead of the usual one, increasing the chances of success. FSH causes several follicles to mature simultaneously, and LH then triggers the final maturation of the eggs, preparing them for collection.
In IVF, the woman is given FSH and LH injections so multiple eggs mature. The eggs are collected with a thin needle guided by ultrasound, fertilised with sperm in a laboratory dish, cultured at 37°C for 2-5 days to form embryos, and one or two embryos are inserted into the uterus.
IVF (in vitro fertilisation) is a fertility treatment where eggs are fertilised by sperm outside the body in laboratory conditions, then implanted into the uterus. In vitro literally means fertilisation in glass, but it happens in shallow petri dishes, not test tubes.
Only one or two embryos are transferred in IVF because transferring more increases the risk of multiple births, such as twins or triplets, which can be dangerous for both mother and babies. Remaining good quality embryos can be frozen for future use.
Test tubes are not used in IVF, even though people call them test tube babies. Fertilisation happens in shallow laboratory dishes called petri dishes.
In IVF, eggs are collected from the ovaries using a thin needle guided by ultrasound, under sedation. This happens once the eggs are mature, usually after 10-14 days of hormone treatment.
IVF usually uses 50,000-100,000 sperm per egg to ensure fertilisation. The healthiest, most active sperm are selected and added to each dish containing an egg.
After 16-18 hours, embryologists check whether sperm has penetrated the egg. Successful fertilisation shows as two nuclei inside the egg.
IVF embryos are kept in incubators at 37°C for 2-5 days. During this time the fertilised eggs develop into balls of cells called embryos.
Remaining good quality IVF embryos can be frozen for future use. This avoids the need to repeat the entire process if the first attempt fails.
The hormone injections in IVF can cause side effects like mood swings and bloating. The process is physically and emotionally demanding, multiple cycles may be needed and there is no guarantee of success.
FSH stimulates egg maturation in the ovaries, while oestrogen is produced by the maturing follicles as a result. Students often confuse the two.