An egg freezing calculator is designed to help women compute the number of eggs they might need to freeze to achieve their desired probability of a live birth in the future.
This calculator takes into account various factors, including the woman’s age at the time of freezing and the number of children she hopes to have.
For example, let’s consider a 32-year-old woman who wants to have two children in the future:
Using egg freezing calculator, she might find that she needs to freeze approximately 15-20 eggs to have a 70-80% chance of having two live births.
If the same woman were 38 years old, she might need to freeze 25-30 eggs to achieve the same probability of success.
Egg Freezing Calculator
| Age | Eggs Frozen | Probability of At Least One Birth |
|---|---|---|
| 30 | 5 | 0.989760 |
| 30 | 10 | 0.999895 |
| 30 | 15 | 0.999999 |
| 33 | 5 | 0.989760 |
| 33 | 10 | 0.999895 |
| 33 | 15 | 0.999999 |
| 35 | 5 | 0.989760 |
| 35 | 10 | 0.999895 |
| 35 | 15 | 0.999999 |
- For women under 35, the goal might be 15-20 frozen eggs for each desired future pregnancy.
- For women 35-37, the goal might increase to 20-30 frozen eggs per desired pregnancy.
- For women 38 and older, even more eggs might be recommended, potentially requiring multiple retrieval cycles.
In a study, it is found that, techniques like IVF (In Vitro Fertilization), ART, and ICSI (Intracytoplasmic Sperm Injection) are designed to enhance the chances of conception. They involve complex procedures that can improve the likelihood of pregnancy compared to natural conception, but they do not eliminate the possibility of failure.
Egg Freezing Success Rates by Age Chart
| Age Group | Number of Eggs Frozen | Success Rate (%) | Notes |
|---|---|---|---|
| Under 35 | 10 | 60 | Higher success rates; optimal age for freezing eggs. |
| Under 35 | 20 | 80 | Significant increase in success rate with more eggs. |
| 35-40 | 10 | 30 | Success rate drops; more eggs needed for similar chances. |
| 40 and older | 10 | <10 | Very low success rate; requires significantly more eggs. |
Egg Freezing Calculation Formula
Number of eggs needed = (Desired number of children) x (Eggs needed per live birth based on age)
Let’s look at some examples:
A 30-year-old woman wanting one child:
- Eggs needed per live birth at 30: approximately 10
- Calculation: 1 x 10 = 10 eggs
A 35-year-old woman wanting two children:
- Eggs needed per live birth at 35: approximately 15
- Calculation: 2 x 15 = 30 eggs
A 40-year-old woman wanting one child:
- Eggs needed per live birth at 40: approximately 25
- Calculation: 1 x 25 = 25 eggs
How Many Eggs to Freeze at 37
For a 37-year-old woman, fertility specialists often recommend freezing 15-20 eggs for each desired future pregnancy.
This higher number accounts for the fact that not all frozen eggs will successfully thaw, fertilize, develop into viable embryos, and result in a live birth.
At age 37, a woman considering egg freezing should aim to freeze a higher number of eggs compared to younger women.
This is because both egg quantity and quality tend to decline more rapidly after age 35.
The recommendation of 15-20 eggs is based on several factors:
- Egg quality: At 37, a higher percentage of eggs may have chromosomal abnormalities, reducing the chances of successful fertilization and healthy embryo development.
- Thawing success: Not all frozen eggs will survive the thawing process. The survival rate is typically around 80-90%.
- Fertilization rates: Of the eggs that survive thawing, not all will successfully fertilize. The fertilization rate can vary but is often around 70-80%.
- Embryo development: Not all fertilized eggs will develop into viable embryos suitable for transfer.
- Implantation success: Even with a good-quality embryo, implantation is not guaranteed. Success rates can vary but tend to be lower with advancing maternal age.
How Many Eggs Should a 35-Year-Old Freeze?
For a 35-year-old woman, the recommended number of eggs to freeze is typically between 15-20 eggs for each desired future pregnancy.
This recommendation is based on several key factors:
Age-related fertility decline: At 35, a woman is at the cusp of what is considered advanced maternal age in reproductive terms. While egg quality and quantity are still generally good at this age, they are beginning to decline more rapidly.
Egg quality: The proportion of chromosomally normal eggs starts to decrease more significantly around this age. This means that more eggs may be needed to ensure a good chance of having chromosomally normal embryos.
Future family planning: The number of children a woman wants to have in the future plays a crucial role. If more than one child is desired, the number of eggs to freeze should be multiplied accordingly.
Survival rates: Not all frozen eggs will survive the thawing process. The survival rate is typically around 80-90%.
Fertilization and embryo development: Of the eggs that survive thawing, not all will fertilize successfully or develop into viable embryos. The fertilization rate is often around 70-80%, and not all fertilized eggs will develop into high-quality embryos.
What is the Average Number of Eggs Retrieved During Egg Freezing?
The average number of eggs retrieved during an egg freezing cycle is between 10 to 15 eggs per cycle.
Age: One of the most significant factors affecting the number of eggs retrieved is the woman’s age. Younger women (under 35) tend to produce more eggs per cycle, often in the range of 15-20 or more. Women in their late 30s might expect 10-15 eggs, while women over 40 might retrieve fewer, perhaps 5-10 eggs on average.
Ovarian reserve: This refers to the quantity and quality of eggs remaining in the ovaries. Women with a higher ovarian reserve (as measured by tests like AMH and antral follicle count) typically produce more eggs during retrieval.
Response to stimulation: The number of eggs retrieved can depend on how well a woman’s ovaries respond to the hormonal stimulation used in the egg freezing process. Some women are “high responders” and produce many eggs, while others are “low responders” and produce fewer.
Health factors: Certain health conditions, such as polycystic ovary syndrome (PCOS), can affect egg production. Women with PCOS might produce a higher number of eggs, sometimes 20 or more.
Medication protocol: The type and dosage of fertility medications used during the stimulation phase can influence the number of eggs produced.
Is 32 Too Late to Freeze Eggs?
At age 32, egg freezing can be an excellent option for women who want to preserve their fertility for the future. In fact, many fertility specialists consider the early 30s to be an ideal time for egg freezing.
Egg quality: At 32, egg quality is generally still quite good. The risk of chromosomal abnormalities in eggs, which increases with age, is still relatively low at this point.
Egg quantity: While egg count (ovarian reserve) has started to decline by age 32, most women still have a good number of eggs available. This often means that fewer stimulation cycles may be needed to retrieve the desired number of eggs compared to freezing at an older age.
Success rates: The success rates for future pregnancies using eggs frozen at age 32 are generally higher compared to eggs frozen at later ages. The live birth rate per thawed egg for women under 35 is approximately 7-10%.
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