Most women reach menopause by their early fifties, and biological infertility occurs about 10–12 years before menopause. With increasing age, fertility in women declines. What is the effect of female age and fertility? *CRGW will consider an increase in age for a known egg donor on a case by case basis, this will be after a full clinical assessment of the donor and recipient/s and once all parties are fully aware of any risks involved to both parties (recipient and donor) and are happy to proceed with treatment. Table updated to reflect current guidelines December 2019. So what should does my BMI need to be for treatment at CRGW?ĭue to effect on successful outcome and risks both during fertility treatment and any pregnancy resulting from fertility treatment at CRGW, we set our BMI limits for female patients receiving treatment as: Treatment A raised male BMI is associated with a significant reduction in clinical pregnancy rate and live birth rate in patients having IVF. Men with a BMI of 30 or over are more likely to have reduced fertility and a reduced likelihood of becoming a father. How about BMI in men undergoing fertility treatment? Increasing BMI is associated with increased incidence of pre-eclampsia, gestational hypertension, high birth weight in babies, induction of labour and caesarean delivery. Women who were overweight or obese (BMI ⩾25) have significantly lower clinical pregnancy and live-birth rates and significantly higher miscarriage rate compared with women with a BMI < 25 following treatment. What about risks in pregnancy with a higher BMI? Increased BMI also effects embryo development negatively impacting blastocyst formation rate in IVF (less embryos will grow to the day-5 blastocyst stage. Alternatively, altered endometrial receptivity (the ability of the woman’s womb to ‘allow’ implantation) may play a role. Recent studies have suggested decreased egg quality in overweight patients. The mechanism of the negative effect of BMI on IVF outcome is unclear. Why does high BMI lower my chances of success? This makes it difficult to properly measure the follicles in the ovaries, and can also make it hard to be sure where the needle tip is located at all times during the egg retrieval procedure (a potential safety issue). Therefore, it is often difficult to clearly visualize the ovaries and the egg-containing follicles. Another problem is that the ultrasound images become very “fuzzy” from the extra tissue between the probe and the ovary. If the ovaries are too high, we can not safely get the needle into the follicles to get the eggs out. At the time of IVF, the needle is pushed in vaginally to reach the eggs in the ovaries. When a woman is significantly overweight, the ovaries are usually pushed up “high” away from the top of the vagina by the extra fatty tissue that is in the pelvis. With increasing BMI, there is a steady and significant decrease in implantation rate, clinical pregnancy rate, and live birth rate and an increase in pregnancy loss.Īnother issue related to body weight and IVF is safety for the patient at the egg retrieval. IVF success rates are most favourable in patients with low and normal BMIs. A BMI over 30 has a significant negative effect on IVF pregnancy success rates. Guidelines indicate that your chances of getting pregnant with IVF are better if your BMI is between 19 and 30. National guidelines on obesity and infertility are very clear your weight can affect your fertility. You can work out your BMI by using a BMI calculator.ĭoes elevated BMI effect my chances of having a baby? Body mass index (BMI) is a measure of body fat based on your weight in relation to your height, and applies to most adult men and women aged 20 and over.
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