Blastocyst transfer has a greater possibility of forming a child after it is infiltrated into the patient. Study and information collected on the blastocyst transfer on 5 to 6 days show that the pregnancy rates are double as compared to the split-phase of embryos that has been recorded.
In a natural conception after fertilisation, the embryos slide down the fallopian tube into the uterus on day 2 and mandatorily carry on its development and growth into the uterus for 4-5 days prior to entering the blastocyst stage. Hence, culturing an embryo to a blastocyst stage imitates the natural process.
In the IVF process, if a couple manages to generate multiple embryos, it would be difficult for an embryologist on the 2nd or 3rd day of fertilisation to detect the capable embryo which is able to become a blastocyst embryo into the uterus. But restoring embryos in the culture for 4-5 days to a blastocyst is half battle won already. By this stage, the embryos which were not meant to make it have already been arrested and only the better embryos remain. So the probability of selecting the best embryos for the IVF transfer is much higher.
In the fluctuated condition inside the uterus, blastocyst embryos are able to stay alive and develop in the uterus. In the result of that, an improved and uniformly fruitful pregnancy via blastocyst transfer is accomplished.
Then why don't all IVF patients opt for blastocyst?
This is because it all depends on several factors, such as
Blastocyst Transfer is generally recommended for women who have:
Cancelled Cycle
If the embryo number is less, it is possible that embryo growth may be arrested by the 5th day and no blastocyst forms. In such cases, the cycle gets cancelled and the previous steps are needed to repeat.
Expensive
It is an expensive procedure.
