The success rates of Preimplantation Genetic Diagnosis IVF can be difficult to quantify. Each case is very different so one couple may have a considerably better chance of falling pregnant than another. There are also significant variations in the PGD success rates of different clinics and hospitals. This may be a result of differences in the quality of treatment given but more often it's due to the types of patient a clinic sees or the method used to calculate their figures.
If you look at overall averages, Preimplantation Genetic Diagnosis IVF treatment has approximate success rates of between 25-35% per cycle. However, PGD expertise is increasing at a considerable rate. Some specialist IVF clinics are now declaring pregnancy rates of up to 45%.
Many factors have a bearing on the success of Preimplantation Genetic Diagnosis, the most common of which is age. The chances of success decrease with age, especially in women over the age of 39. Indeed, some Primary Care Trusts are now refusing to fund PGD IVF treatment for women in their forties for this very reason.
The female partner's weight can also greatly affect the likelihood of a positive outcome. Overweight women don't respond as well to the medication used in IVF, and may have a higher chance of miscarriage. Excess fat also makes it more difficult to obtain a clear scan picture during egg collection.
Smoking may also adversely affect their Preimplantation Genetic Diagnosis IVF treatment. Smoking has been clinically shown to reduce the chances of conceiving naturally and therefore the success rates of IVF.
Alcohol has not been directly shown to reduce the likelihood of pregnancy, but excess intake can decrease both the production and movement of sperm. It's therfore sensible to refrain, or at least cut back, from drinking during PGD and IVF treatment.
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